MAINT-1144: Merge llhttpclient_test.cpp fix back to tip

50 files changed, 1952 insertions, 1242 deletions

diff --git a/indra/llui/llaccordionctrltab.cpp b/indra/llui/llaccordionctrltab.cpp
index 4b0b7c561d..c025cd7939 100644
--- a/indra/llui/llaccordionctrltab.cpp
+++ b/indra/llui/llaccordionctrltab.cpp
@@ -973,10 +973,10 @@ void LLAccordionCtrlTab::drawChild(const LLRect& root_rect,LLView* child)
 		
 		if ( root_rect.overlaps(screen_rect)  && LLUI::sDirtyRect.overlaps(screen_rect))
 		{
-			glMatrixMode(GL_MODELVIEW);
+			gGL.matrixMode(LLRender::MM_MODELVIEW);
 			LLUI::pushMatrix();
 			{
-				LLUI::translate((F32)child->getRect().mLeft, (F32)child->getRect().mBottom, 0.f);
+				LLUI::translate((F32)child->getRect().mLeft, (F32)child->getRect().mBottom);
 				child->draw();
 
 			}
diff --git a/indra/llui/llbutton.cpp b/indra/llui/llbutton.cpp
index 74b8885e1f..705fe16559 100644
--- a/indra/llui/llbutton.cpp
+++ b/indra/llui/llbutton.cpp
@@ -115,7 +115,7 @@ LLButton::Params::Params()
 
 LLButton::LLButton(const LLButton::Params& p)
 :	LLUICtrl(p),
-	LLBadgeOwner(LLView::getHandle()),
+	LLBadgeOwner(getHandle()),
 	mMouseDownFrame(0),
 	mMouseHeldDownCount(0),
 	mBorderEnabled( FALSE ),
@@ -589,15 +589,23 @@ void LLButton::getOverlayImageSize(S32& overlay_width, S32& overlay_height)
 // virtual
 void LLButton::draw()
 {
+	static LLCachedControl<bool> sEnableButtonFlashing(*LLUI::sSettingGroups["config"], "EnableButtonFlashing", true);
 	F32 alpha = mUseDrawContextAlpha ? getDrawContext().mAlpha : getCurrentTransparency();
 	bool flash = FALSE;
 
-	if( mFlashing )
+	if( mFlashing)
 	{
-		F32 elapsed = mFlashingTimer.getElapsedTimeF32();
-		S32 flash_count = S32(elapsed * mButtonFlashRate * 2.f);
-		// flash on or off?
-		flash = (flash_count % 2 == 0) || flash_count > S32((F32)mButtonFlashCount * 2.f);
+		if ( sEnableButtonFlashing)
+		{
+			F32 elapsed = mFlashingTimer.getElapsedTimeF32();
+			S32 flash_count = S32(elapsed * mButtonFlashRate * 2.f);
+			// flash on or off?
+			flash = (flash_count % 2 == 0) || flash_count > S32((F32)mButtonFlashCount * 2.f);
+		}
+		else
+		{ // otherwise just highlight button in flash color
+			flash = true;
+		}
 	}
 
 	bool pressed_by_keyboard = FALSE;
@@ -900,9 +908,9 @@ void LLButton::draw()
 		// Not sure if it is really needed. Probably S32_MAX should be always passed as max_chars.
 		mLastDrawCharsCount = mGLFont->render(label, 0,
 			(F32)x,
-			(F32)(mBottomVPad + y_offset),
+			(F32)(getRect().getHeight() / 2 + mBottomVPad),
 			label_color % alpha,
-			mHAlign, LLFontGL::BOTTOM,
+			mHAlign, LLFontGL::VCENTER,
 			LLFontGL::NORMAL,
 			mDropShadowedText ? LLFontGL::DROP_SHADOW_SOFT : LLFontGL::NO_SHADOW,
 			S32_MAX, text_width,
@@ -1234,7 +1242,6 @@ void LLButton::resetMouseDownTimer()
 	mMouseDownTimer.reset();
 }
 
-
 BOOL LLButton::handleDoubleClick(S32 x, S32 y, MASK mask)
 {
 	// just treat a double click as a second click
diff --git a/indra/llui/llclipboard.cpp b/indra/llui/llclipboard.cpp
index 6910b962a1..14173fdbb0 100644
--- a/indra/llui/llclipboard.cpp
+++ b/indra/llui/llclipboard.cpp
@@ -34,109 +34,113 @@
 #include "llview.h"
 #include "llwindow.h"
 
-// Global singleton
-LLClipboard gClipboard;
-
-
-LLClipboard::LLClipboard()
+LLClipboard::LLClipboard() :
+	mGeneration(0)
 {
-	mSourceItem = NULL;
+	reset();
 }
 
-
 LLClipboard::~LLClipboard()
 {
+	reset();
 }
 
-
-void LLClipboard::copyFromSubstring(const LLWString &src, S32 pos, S32 len, const LLUUID& source_id )
+void LLClipboard::reset()
 {
-	mSourceID = source_id;
-	mString = src.substr(pos, len);
-	LLView::getWindow()->copyTextToClipboard( mString );
+	// Increment the clipboard count
+	mGeneration++;
+	// Clear the clipboard
+	mObjects.clear();
+	mCutMode = false;
+	mString = LLWString();
 }
 
-void LLClipboard::copyFromString(const LLWString &src, const LLUUID& source_id )
+// Copy the input uuid to the LL clipboard
+bool LLClipboard::copyToClipboard(const LLUUID& src, const LLAssetType::EType type)
 {
-	mSourceID = source_id;
-	mString = src;
-	LLView::getWindow()->copyTextToClipboard( mString );
+	reset();
+	return addToClipboard(src, type);
 }
 
-const LLWString& LLClipboard::getPasteWString( LLUUID* source_id )
+// Add the input uuid to the LL clipboard
+// Convert the uuid to string and concatenate that string to the system clipboard if legit
+bool LLClipboard::addToClipboard(const LLUUID& src, const LLAssetType::EType type)
 {
-	if( mSourceID.notNull() )
+	bool res = false;
+	if (src.notNull())
 	{
-		LLWString temp_string;
-		LLView::getWindow()->pasteTextFromClipboard(temp_string);
-
-		if( temp_string != mString )
+		res = true;
+		if (LLAssetType::lookupIsAssetIDKnowable(type))
 		{
-			mSourceID.setNull();
-			mString = temp_string;
+			LLWString source = utf8str_to_wstring(src.asString());
+			res = addToClipboard(source, 0, source.size());
+		}
+		if (res)
+		{
+			mObjects.push_back(src);
+			mGeneration++;
 		}
 	}
-	else
-	{
-		LLView::getWindow()->pasteTextFromClipboard(mString);
-	}
+	return res;
+}
 
-	if( source_id )
+bool LLClipboard::pasteFromClipboard(std::vector<LLUUID>& inv_objects) const
+{
+	bool res = false;
+	S32 count = mObjects.size();
+	if (count > 0)
 	{
-		*source_id = mSourceID;
+		res = true;
+		inv_objects.clear();
+		for (S32 i = 0; i < count; i++)
+		{
+			inv_objects.push_back(mObjects[i]);
+		}
 	}
-
-	return mString;
+	return res;
 }
 
+// Returns true if the LL Clipboard has pasteable items in it
+bool LLClipboard::hasContents() const
+{
+	return (mObjects.size() > 0);
+}
 
-BOOL LLClipboard::canPasteString() const
+// Returns true if the input uuid is in the list of clipboard objects
+bool LLClipboard::isOnClipboard(const LLUUID& object) const
 {
-	return LLView::getWindow()->isClipboardTextAvailable();
+	std::vector<LLUUID>::const_iterator iter = std::find(mObjects.begin(), mObjects.end(), object);
+	return (iter != mObjects.end());
 }
 
+// Copy the input string to the LL and the system clipboard
+bool LLClipboard::copyToClipboard(const LLWString &src, S32 pos, S32 len, bool use_primary)
+{
+	return addToClipboard(src, pos, len, use_primary);
+}
 
-void LLClipboard::copyFromPrimarySubstring(const LLWString &src, S32 pos, S32 len, const LLUUID& source_id )
+// Concatenate the input string to the LL and the system clipboard
+bool LLClipboard::addToClipboard(const LLWString &src, S32 pos, S32 len, bool use_primary)
 {
-	mSourceID = source_id;
 	mString = src.substr(pos, len);
-	LLView::getWindow()->copyTextToPrimary( mString );
+	return (use_primary ? LLView::getWindow()->copyTextToPrimary(mString) : LLView::getWindow()->copyTextToClipboard(mString));
 }
 
-
-const LLWString& LLClipboard::getPastePrimaryWString( LLUUID* source_id )
+// Copy the System clipboard to the output string.
+// Manage the LL Clipboard / System clipboard consistency
+bool LLClipboard::pasteFromClipboard(LLWString &dst, bool use_primary)
 {
-	if( mSourceID.notNull() )
-	{
-		LLWString temp_string;
-		LLView::getWindow()->pasteTextFromPrimary(temp_string);
-
-		if( temp_string != mString )
-		{
-			mSourceID.setNull();
-			mString = temp_string;
-		}
-	}
-	else
-	{
-		LLView::getWindow()->pasteTextFromPrimary(mString);
-	}
-
-	if( source_id )
+	bool res = (use_primary ? LLView::getWindow()->pasteTextFromPrimary(dst) : LLView::getWindow()->pasteTextFromClipboard(dst));
+	if (res)
 	{
-		*source_id = mSourceID;
+		mString = dst;
 	}
-
-	return mString;
+	return res;
 }
 
-
-BOOL LLClipboard::canPastePrimaryString() const
+// Return true if there's something on the System clipboard
+bool LLClipboard::isTextAvailable(bool use_primary) const
 {
-	return LLView::getWindow()->isPrimaryTextAvailable();
+	return (use_primary ? LLView::getWindow()->isPrimaryTextAvailable() : LLView::getWindow()->isClipboardTextAvailable());
 }
 
-void LLClipboard::setSourceObject(const LLUUID& source_id, LLAssetType::EType type) 
-{
-	mSourceItem = new LLInventoryObject (source_id, LLUUID::null, type, "");
-}
diff --git a/indra/llui/llclipboard.h b/indra/llui/llclipboard.h
index 9371b94284..fd2e7610df 100644
--- a/indra/llui/llclipboard.h
+++ b/indra/llui/llclipboard.h
@@ -27,46 +27,68 @@
 #ifndef LL_LLCLIPBOARD_H
 #define LL_LLCLIPBOARD_H
 
+#include <boost/function.hpp>
 
 #include "llstring.h"
 #include "lluuid.h"
 #include "stdenums.h"
+#include "llsingleton.h"
+#include "llassettype.h"
 #include "llinventory.h"
 
+//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+// Class LLClipboard
+//
+// This class is used to cut/copy/paste text strings and inventory items around 
+// the world. Use LLClipboard::instance().method() to use its methods.
+// Note that the text and UUIDs are loosely coupled only. There are few cases
+// where the viewer does offer a serialized version of the UUID on the clipboard.
+// In those case, the text is overridden when copying/cutting the item. 
+// In all other cases, the text and the UUIDs are very much independent.
+//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
-class LLClipboard
+class LLClipboard : public LLSingleton<LLClipboard>
 {
 public:
 	LLClipboard();
 	~LLClipboard();
+	
+	// Clears the clipboard
+	void reset();
+	// Returns the state of the clipboard so client can know if it has been modified (comparing with tracked state)
+	int	getGeneration() const { return mGeneration; }
 
-	/* We support two flavors of clipboard.  The default is the explicitly
-	   copy-and-pasted clipboard.  The second is the so-called 'primary' clipboard
-	   which is implicitly copied upon selection on platforms which expect this
-	   (i.e. X11/Linux). */
-
-	void		copyFromSubstring(const LLWString &copy_from, S32 pos, S32 len, const LLUUID& source_id = LLUUID::null );
-	void		copyFromString(const LLWString &copy_from, const LLUUID& source_id = LLUUID::null );
-	BOOL		canPasteString() const;
-	const LLWString&	getPasteWString(LLUUID* source_id = NULL);
+	// Text strings management:
+	// ------------------------
+	// We support two flavors of text clipboards. The default is the explicitly
+	// copy-and-pasted clipboard. The second is the so-called 'primary' clipboard
+	// which is implicitly copied upon selection on platforms which expect this
+	// (i.e. X11/Linux, Mac).
+	bool copyToClipboard(const LLWString& src, S32 pos, S32 len, bool use_primary = false);
+	bool addToClipboard(const LLWString& src, S32 pos, S32 len, bool use_primary = false);
+	bool pasteFromClipboard(LLWString& dst, bool use_primary = false);
+	bool isTextAvailable(bool use_primary = false) const;
+	
+	// Object list management:
+	// -----------------------
+	// Clears and adds one single object to the clipboard
+	bool copyToClipboard(const LLUUID& src, const LLAssetType::EType type = LLAssetType::AT_NONE);
+	// Adds one object to the current list of objects on the clipboard
+	bool addToClipboard(const LLUUID& src, const LLAssetType::EType type = LLAssetType::AT_NONE);
+	// Gets a copy of the objects on the clipboard
+	bool pasteFromClipboard(std::vector<LLUUID>& inventory_objects) const;
+	
+	bool hasContents() const;										// True if the clipboard has pasteable objects
+	bool isOnClipboard(const LLUUID& object) const;					// True if the input object uuid is on the clipboard
 
-	void		copyFromPrimarySubstring(const LLWString &copy_from, S32 pos, S32 len, const LLUUID& source_id = LLUUID::null );
-	BOOL		canPastePrimaryString() const;
-	const LLWString&	getPastePrimaryWString(LLUUID* source_id = NULL);	
+	bool isCutMode() const { return mCutMode; }
+	void setCutMode(bool mode) { mCutMode = mode; mGeneration++; }
 
-	// Support clipboard for object known only by their uuid and asset type
-	void		  setSourceObject(const LLUUID& source_id, LLAssetType::EType type);
-	const LLInventoryObject* getSourceObject() { return mSourceItem; }
-	
 private:
-	LLUUID      mSourceID;
-	LLWString	mString;
-	LLInventoryObject* mSourceItem;
+	std::vector<LLUUID> mObjects;		// Objects on the clipboard. Can be empty while mString contains something licit (e.g. text from chat)
+	LLWString mString;					// The text string. If mObjects is not empty, this string is reflecting them (UUIDs for the moment) if the asset type is knowable.
+	bool mCutMode;						// This is a convenience flag for the viewer.
+	int mGeneration;					// Incremented when the clipboard changes so that interested parties can check for changes on the clipboard.	
 };
 
-
-// Global singleton
-extern LLClipboard gClipboard;
-
-
 #endif  // LL_LLCLIPBOARD_H
diff --git a/indra/llui/llcombobox.cpp b/indra/llui/llcombobox.cpp
index 89d8842393..806d2ef3f6 100644
--- a/indra/llui/llcombobox.cpp
+++ b/indra/llui/llcombobox.cpp
@@ -613,7 +613,7 @@ void LLComboBox::showList()
 	}
 	mList->setOrigin(rect.mLeft, rect.mBottom);
 	mList->reshape(rect.getWidth(), rect.getHeight());
-	mList->translateIntoRect(root_view_local, FALSE);
+	mList->translateIntoRect(root_view_local);
 
 	// Make sure we didn't go off bottom of screen
 	S32 x, y;
diff --git a/indra/llui/lldraghandle.cpp b/indra/llui/lldraghandle.cpp
index 42e6c3c786..5f69c6af31 100644
--- a/indra/llui/lldraghandle.cpp
+++ b/indra/llui/lldraghandle.cpp
@@ -244,7 +244,7 @@ void LLDragHandleTop::reshapeTitleBox()
 	const LLFontGL* font = LLFontGL::getFontSansSerif();
 	S32 title_width = getRect().getWidth();
 	title_width -= LEFT_PAD + 2 * BORDER_PAD + getButtonsRect().getWidth();
-	S32 title_height = llround(font->getLineHeight());
+	S32 title_height = font->getLineHeight();
 	LLRect title_rect;
 	title_rect.setLeftTopAndSize( 
 		LEFT_PAD, 
diff --git a/indra/llui/llfloater.cpp b/indra/llui/llfloater.cpp
index 432397d3e9..8ca1e685a9 100644
--- a/indra/llui/llfloater.cpp
+++ b/indra/llui/llfloater.cpp
@@ -58,6 +58,8 @@
 #include "llhelp.h"
 #include "llmultifloater.h"
 #include "llsdutil.h"
+#include <boost/foreach.hpp>
+
 
 // use this to control "jumping" behavior when Ctrl-Tabbing
 const S32 TABBED_FLOATER_OFFSET = 0;
@@ -66,10 +68,10 @@ namespace LLInitParam
 {
 	void TypeValues<LLFloaterEnums::EOpenPositioning>::declareValues()
 	{
-		declare("none",       LLFloaterEnums::OPEN_POSITIONING_NONE);
-		declare("cascading",  LLFloaterEnums::OPEN_POSITIONING_CASCADING);
-		declare("centered",   LLFloaterEnums::OPEN_POSITIONING_CENTERED);
-		declare("specified",  LLFloaterEnums::OPEN_POSITIONING_SPECIFIED);
+		declare("relative",   LLFloaterEnums::POSITIONING_RELATIVE);
+		declare("cascading",  LLFloaterEnums::POSITIONING_CASCADING);
+		declare("centered",   LLFloaterEnums::POSITIONING_CENTERED);
+		declare("specified",  LLFloaterEnums::POSITIONING_SPECIFIED);
 	}
 }
 
@@ -111,7 +113,6 @@ LLFloater::click_callback LLFloater::sButtonCallbacks[BUTTON_COUNT] =
 
 LLMultiFloater* LLFloater::sHostp = NULL;
 BOOL			LLFloater::sQuitting = FALSE; // Flag to prevent storing visibility controls while quitting
-LLFloater::handle_map_t	LLFloater::sFloaterMap;
 
 LLFloaterView* gFloaterView = NULL;
 
@@ -176,9 +177,7 @@ LLFloater::Params::Params()
 	save_visibility("save_visibility", false),
 	can_dock("can_dock", false),
 	show_title("show_title", true),
-	open_positioning("open_positioning", LLFloaterEnums::OPEN_POSITIONING_NONE),
-	specified_left("specified_left"),
-	specified_bottom("specified_bottom"),
+	positioning("positioning", LLFloaterEnums::POSITIONING_RELATIVE),
 	header_height("header_height", 0),
 	legacy_header_height("legacy_header_height", 0),
 	close_image("close_image"),
@@ -194,7 +193,8 @@ LLFloater::Params::Params()
 	dock_pressed_image("dock_pressed_image"),
 	help_pressed_image("help_pressed_image"),
 	open_callback("open_callback"),
-	close_callback("close_callback")
+	close_callback("close_callback"),
+	follows("follows")
 {
 	changeDefault(visible, false);
 }
@@ -247,9 +247,7 @@ LLFloater::LLFloater(const LLSD& key, const LLFloater::Params& p)
 	mCanClose(p.can_close),
 	mDragOnLeft(p.can_drag_on_left),
 	mResizable(p.can_resize),
-	mOpenPositioning(p.open_positioning),
-	mSpecifiedLeft(p.specified_left),
-	mSpecifiedBottom(p.specified_bottom),
+	mPositioning(p.positioning),
 	mMinWidth(p.min_width),
 	mMinHeight(p.min_height),
 	mHeaderHeight(p.header_height),
@@ -268,7 +266,7 @@ LLFloater::LLFloater(const LLSD& key, const LLFloater::Params& p)
 	mMinimizeSignal(NULL)
 //	mNotificationContext(NULL)
 {
-	mHandle.bind(this);
+	mPosition.setFloater(*this);
 //	mNotificationContext = new LLFloaterNotificationContext(getHandle());
 
 	// Clicks stop here.
@@ -323,9 +321,6 @@ void LLFloater::initFloater(const Params& p)
 	// Floaters are created in the invisible state	
 	setVisible(FALSE);
 
-	// add self to handle->floater map
-	sFloaterMap[mHandle] = this;
-
 	if (!getParent())
 	{
 		gFloaterView->addChild(this);
@@ -532,8 +527,6 @@ LLFloater::~LLFloater()
 	// correct, non-minimized positions.
 	setMinimized( FALSE );
 
-	sFloaterMap.erase(mHandle);
-
 	delete mDragHandle;
 	for (S32 i = 0; i < 4; i++) 
 	{
@@ -550,10 +543,18 @@ LLFloater::~LLFloater()
 
 void LLFloater::storeRectControl()
 {
-	if( mRectControl.size() > 1 )
+	if (!mRectControl.empty())
 	{
 		getControlGroup()->setRect( mRectControl, getRect() );
 	}
+	if (!mPosXControl.empty() && mPositioning == LLFloaterEnums::POSITIONING_RELATIVE)
+	{
+		getControlGroup()->setF32( mPosXControl, mPosition.mX );
+	}
+	if (!mPosYControl.empty() && mPositioning == LLFloaterEnums::POSITIONING_RELATIVE)
+	{
+		getControlGroup()->setF32( mPosYControl, mPosition.mY );
+	}
 }
 
 void LLFloater::storeVisibilityControl()
@@ -572,23 +573,6 @@ void LLFloater::storeDockStateControl()
 	}
 }
 
-LLRect LLFloater::getSavedRect() const
-{
-	LLRect rect;
-
-	if (mRectControl.size() > 1)
-	{
-		rect = getControlGroup()->getRect(mRectControl);
-	}
-
-	return rect;
-}
-
-bool LLFloater::hasSavedRect() const
-{
-	return !getSavedRect().isEmpty();
-}
-
 // static
 std::string LLFloater::getControlName(const std::string& name, const LLSD& key)
 {
@@ -866,7 +850,7 @@ void LLFloater::applyControlsAndPosition(LLFloater* other)
 	{
 		if (!applyRectControl())
 		{
-			applyPositioning(other);
+			applyPositioning(other, true);
 		}
 	}
 }
@@ -875,29 +859,68 @@ bool LLFloater::applyRectControl()
 {
 	bool saved_rect = false;
 
+	LLRect screen_rect = calcScreenRect();
+	mPosition = LLCoordGL(screen_rect.getCenterX(), screen_rect.getCenterY()).convert();
+	
 	LLFloater* last_in_group = LLFloaterReg::getLastFloaterInGroup(mInstanceName);
 	if (last_in_group && last_in_group != this)
 	{
 		// other floaters in our group, position ourselves relative to them and don't save the rect
 		mRectControl.clear();
-		mOpenPositioning = LLFloaterEnums::OPEN_POSITIONING_CASCADE_GROUP;
+		mPositioning = LLFloaterEnums::POSITIONING_CASCADE_GROUP;
 	}
-	else if (mRectControl.size() > 1)
+	else
 	{
-		// If we have a saved rect, use it
-		const LLRect& rect = getControlGroup()->getRect(mRectControl);
-		saved_rect = rect.notEmpty();
-		if (saved_rect)
+		bool rect_specified = false;
+		if (!mRectControl.empty())
 		{
-			setOrigin(rect.mLeft, rect.mBottom);
-
-			if (mResizable)
+			// If we have a saved rect, use it
+			const LLRect& rect = getControlGroup()->getRect(mRectControl);
+			if (rect.notEmpty()) saved_rect = true;
+			if (saved_rect)
 			{
-				reshape(llmax(mMinWidth, rect.getWidth()), llmax(mMinHeight, rect.getHeight()));
+				setOrigin(rect.mLeft, rect.mBottom);
+
+				if (mResizable)
+				{
+					reshape(llmax(mMinWidth, rect.getWidth()), llmax(mMinHeight, rect.getHeight()));
+				}
+				mPositioning = LLFloaterEnums::POSITIONING_RELATIVE;
+				LLRect screen_rect = calcScreenRect();
+				mPosition = LLCoordGL(screen_rect.getCenterX(), screen_rect.getCenterY()).convert();
+				rect_specified = true;
 			}
 		}
+
+		LLControlVariablePtr x_control = getControlGroup()->getControl(mPosXControl);
+		LLControlVariablePtr y_control = getControlGroup()->getControl(mPosYControl);
+		if (x_control.notNull() 
+			&& y_control.notNull()
+			&& !x_control->isDefault()
+			&& !y_control->isDefault())
+		{
+			mPosition.mX = x_control->getValue().asReal();
+			mPosition.mY = y_control->getValue().asReal();
+			mPositioning = LLFloaterEnums::POSITIONING_RELATIVE;
+			applyRelativePosition();
+
+			saved_rect = true;
+		}
+
+		// remember updated position
+		if (rect_specified)
+		{
+			storeRectControl();
+		}
 	}
 
+	if (saved_rect)
+	{
+		// propagate any derived positioning data back to settings file
+		storeRectControl();
+	}
+
+
 	return saved_rect;
 }
 
@@ -914,50 +937,56 @@ bool LLFloater::applyDockState()
 	return docked;
 }
 
-void LLFloater::applyPositioning(LLFloater* other)
+void LLFloater::applyPositioning(LLFloater* other, bool on_open)
 {
 	// Otherwise position according to the positioning code
-	switch (mOpenPositioning)
+	switch (mPositioning)
 	{
-	case LLFloaterEnums::OPEN_POSITIONING_CENTERED:
+	case LLFloaterEnums::POSITIONING_CENTERED:
 		center();
 		break;
 
-	case LLFloaterEnums::OPEN_POSITIONING_SPECIFIED:
-		{
-			// Translate relative to snap rect
-			setOrigin(mSpecifiedLeft, mSpecifiedBottom);
-			const LLRect& snap_rect = gFloaterView->getSnapRect();
-			translate(snap_rect.mLeft, snap_rect.mBottom);
-			translateIntoRect(snap_rect, FALSE);
-		}
+	case LLFloaterEnums::POSITIONING_SPECIFIED:
 		break;
 
-	case LLFloaterEnums::OPEN_POSITIONING_CASCADE_GROUP:
-	case LLFloaterEnums::OPEN_POSITIONING_CASCADING:
-		if (other != NULL && other != this)
+	case LLFloaterEnums::POSITIONING_CASCADING:
+		if (!on_open)
 		{
-			stackWith(*other);
+			applyRelativePosition();
 		}
-		else
+		// fall through
+	case LLFloaterEnums::POSITIONING_CASCADE_GROUP:
+		if (on_open)
 		{
-			static const U32 CASCADING_FLOATER_HOFFSET = 0;
-			static const U32 CASCADING_FLOATER_VOFFSET = 0;
+			if (other != NULL && other != this)
+			{
+				stackWith(*other);
+			}
+			else
+			{
+				static const U32 CASCADING_FLOATER_HOFFSET = 0;
+				static const U32 CASCADING_FLOATER_VOFFSET = 0;
 			
-			const LLRect& snap_rect = gFloaterView->getSnapRect();
+				const LLRect& snap_rect = gFloaterView->getSnapRect();
 
-			const S32 horizontal_offset = CASCADING_FLOATER_HOFFSET;
-			const S32 vertical_offset = snap_rect.getHeight() - CASCADING_FLOATER_VOFFSET;
+				const S32 horizontal_offset = CASCADING_FLOATER_HOFFSET;
+				const S32 vertical_offset = snap_rect.getHeight() - CASCADING_FLOATER_VOFFSET;
 
-			S32 rect_height = getRect().getHeight();
-			setOrigin(horizontal_offset, vertical_offset - rect_height);
+				S32 rect_height = getRect().getHeight();
+				setOrigin(horizontal_offset, vertical_offset - rect_height);
 
-			translate(snap_rect.mLeft, snap_rect.mBottom);
-			translateIntoRect(snap_rect, FALSE);
+				translate(snap_rect.mLeft, snap_rect.mBottom);
+			}
+			setFollows(FOLLOWS_TOP | FOLLOWS_LEFT);
 		}
 		break;
 
-	case LLFloaterEnums::OPEN_POSITIONING_NONE:
+	case LLFloaterEnums::POSITIONING_RELATIVE:
+		{
+			applyRelativePosition();
+
+			break;
+		}
 	default:
 		// Do nothing
 		break;
@@ -1038,7 +1067,9 @@ BOOL LLFloater::canSnapTo(const LLView* other_view)
 	if (other_view != getParent())
 	{
 		const LLFloater* other_floaterp = dynamic_cast<const LLFloater*>(other_view);		
-		if (other_floaterp && other_floaterp->getSnapTarget() == getHandle() && mDependents.find(other_floaterp->getHandle()) != mDependents.end())
+		if (other_floaterp 
+			&& other_floaterp->getSnapTarget() == getHandle() 
+			&& mDependents.find(other_floaterp->getHandle()) != mDependents.end())
 		{
 			// this is a dependent that is already snapped to us, so don't snap back to it
 			return FALSE;
@@ -1073,7 +1104,9 @@ void LLFloater::handleReshape(const LLRect& new_rect, bool by_user)
 	if (by_user && !isMinimized())
 	{
 		storeRectControl();
-		mOpenPositioning = LLFloaterEnums::OPEN_POSITIONING_NONE;
+		mPositioning = LLFloaterEnums::POSITIONING_RELATIVE;
+		LLRect screen_rect = calcScreenRect();
+		mPosition = LLCoordGL(screen_rect.getCenterX(), screen_rect.getCenterY()).convert();
 	}
 
 	// if not minimized, adjust all snapped dependents to new shape
@@ -1251,6 +1284,7 @@ void LLFloater::setMinimized(BOOL minimize)
 
 		// Reshape *after* setting mMinimized
 		reshape( mExpandedRect.getWidth(), mExpandedRect.getHeight(), TRUE );
+		applyPositioning(NULL, false);
 	}
 
 	make_ui_sound("UISndWindowClose");
@@ -1591,7 +1625,7 @@ void LLFloater::setDocked(bool docked, bool pop_on_undock)
 		if (mDocked)
 		{
 			setMinimized(FALSE);
-			mOpenPositioning = LLFloaterEnums::OPEN_POSITIONING_NONE;
+			mPositioning = LLFloaterEnums::POSITIONING_RELATIVE;
 		}
 
 		updateTitleButtons();
@@ -1625,7 +1659,7 @@ void LLFloater::onClickTearOff(LLFloater* self)
 		self->openFloater(self->getKey());
 		
 		// only force position for floaters that don't have that data saved
-		if (self->mRectControl.size() <= 1)
+		if (self->mRectControl.empty())
 		{
 			new_rect.setLeftTopAndSize(host_floater->getRect().mLeft + 5, host_floater->getRect().mTop - floater_header_size - 5, self->getRect().getWidth(), self->getRect().getHeight());
 			self->setRect(new_rect);
@@ -1677,18 +1711,19 @@ void LLFloater::onClickHelp( LLFloater* self )
 LLFloater* LLFloater::getClosableFloaterFromFocus()
 {
 	LLFloater* focused_floater = NULL;
-
-	handle_map_iter_t iter;
-	for(iter = sFloaterMap.begin(); iter != sFloaterMap.end(); ++iter)
+	LLInstanceTracker<LLFloater>::instance_iter it = beginInstances();
+	LLInstanceTracker<LLFloater>::instance_iter end_it = endInstances();
+	for (; it != end_it; ++it)
 	{
-		focused_floater = iter->second;
-		if (focused_floater->hasFocus())
+		if (it->hasFocus())
 		{
+			LLFloater& floater = *it;
+			focused_floater = &floater;
 			break;
 		}
 	}
 
-	if (iter == sFloaterMap.end())
+	if (it == endInstances())
 	{
 		// nothing found, return
 		return NULL;
@@ -1803,7 +1838,7 @@ void LLFloater::draw()
 				
 				const LLFontGL* font = LLFontGL::getFontSansSerif();
 				LLRect r = getRect();
-				gl_rect_2d_offset_local(0, r.getHeight(), r.getWidth(), r.getHeight() - (S32)font->getLineHeight() - 1, 
+				gl_rect_2d_offset_local(0, r.getHeight(), r.getWidth(), r.getHeight() - font->getLineHeight() - 1, 
 					titlebar_focus_color % alpha, 0, TRUE);
 			}
 		}
@@ -1949,6 +1984,12 @@ void LLFloater::setCanDrag(BOOL can_drag)
 	}
 }
 
+bool LLFloater::getCanDrag()
+{
+	return mDragHandle->getEnabled();
+}
+
+
 void LLFloater::updateTitleButtons()
 {
 	static LLUICachedControl<S32> floater_close_box_size ("UIFloaterCloseBoxSize", 0);
@@ -2158,13 +2199,15 @@ LLFloaterView::LLFloaterView (const Params& p)
 	mSnapOffsetBottom(0),
 	mSnapOffsetRight(0)
 {
+	mSnapView = getHandle();
 }
 
 // By default, adjust vertical.
 void LLFloaterView::reshape(S32 width, S32 height, BOOL called_from_parent)
 {
-	S32 old_width = getRect().getWidth();
-	S32 old_height = getRect().getHeight();
+	LLView::reshape(width, height, called_from_parent);
+
+	mLastSnapRect = getSnapRect();
 
 	for ( child_list_const_iter_t child_it = getChildList()->begin(); child_it != getChildList()->end(); ++child_it)
 	{
@@ -2172,66 +2215,52 @@ void LLFloaterView::reshape(S32 width, S32 height, BOOL called_from_parent)
 		LLFloater* floaterp = (LLFloater*)viewp;
 		if (floaterp->isDependent())
 		{
-			// dependents use same follow flags as their "dependee"
+			// dependents are moved with their "dependee"
 			continue;
 		}
 
-		// Make if follow the edge it is closest to
-		U32 follow_flags = 0x0;
-
-		if (floaterp->isMinimized())
+		if (!floaterp->isMinimized() && floaterp->getCanDrag())
 		{
-			follow_flags |= (FOLLOWS_LEFT | FOLLOWS_TOP);
-		}
-		else
-		{
-			LLRect r = floaterp->getRect();
+			LLRect old_rect = floaterp->getRect();
+			floaterp->applyPositioning(NULL, false);
+			LLRect new_rect = floaterp->getRect();
 
-			// Compute absolute distance from each edge of screen
-			S32 left_offset = llabs(r.mLeft - 0);
-			S32 right_offset = llabs(old_width - r.mRight);
+			//LLRect r = floaterp->getRect();
 
-			S32 top_offset = llabs(old_height - r.mTop);
-			S32 bottom_offset = llabs(r.mBottom - 0);
+			//// Compute absolute distance from each edge of screen
+			//S32 left_offset = llabs(r.mLeft - 0);
+			//S32 right_offset = llabs(old_right - r.mRight);
 
+			//S32 top_offset = llabs(old_top - r.mTop);
+			//S32 bottom_offset = llabs(r.mBottom - 0);
 
-			if (left_offset < right_offset)
-			{
-				follow_flags |= FOLLOWS_LEFT;
-			}
-			else
-			{
-				follow_flags |= FOLLOWS_RIGHT;
-			}
+			S32 translate_x = new_rect.mLeft - old_rect.mLeft;
+			S32 translate_y = new_rect.mBottom - old_rect.mBottom;
 
-			// "No vertical adjustment" usually means that the bottom of the view
-			// has been pushed up or down.  Hence we want the floaters to follow
-			// the top.
-			if (top_offset < bottom_offset)
-			{
-				follow_flags |= FOLLOWS_TOP;
-			}
-			else
-			{
-				follow_flags |= FOLLOWS_BOTTOM;
-			}
-		}
+			//if (left_offset > right_offset)
+			//{
+			//	translate_x = new_right - old_right;
+			//}
 
-		floaterp->setFollows(follow_flags);
+			//if (top_offset < bottom_offset)
+			//{
+			//	translate_y = new_top - old_top;
+			//}
 
-		//RN: all dependent floaters copy follow behavior of "parent"
-		for(LLFloater::handle_set_iter_t dependent_it = floaterp->mDependents.begin();
-			dependent_it != floaterp->mDependents.end(); ++dependent_it)
-		{
-			LLFloater* dependent_floaterp = dependent_it->get();
-			if (dependent_floaterp)
+			// don't reposition immovable floaters
+			//if (floaterp->getCanDrag())
+			//{
+			//	floaterp->translate(translate_x, translate_y);
+			//}
+			BOOST_FOREACH(LLHandle<LLFloater> dependent_floater, floaterp->mDependents)
 			{
-				dependent_floaterp->setFollows(follow_flags);
+				if (dependent_floater.get())
+				{
+					dependent_floater.get()->translate(translate_x, translate_y);
+				}
 			}
 		}
 	}
-
-	LLView::reshape(width, height, called_from_parent);
 }
 
 
@@ -2631,6 +2660,12 @@ void LLFloaterView::shiftFloaters(S32 x_offset, S32 y_offset)
 
 void LLFloaterView::refresh()
 {
+	LLRect snap_rect = getSnapRect();
+	if (snap_rect != mLastSnapRect)
+	{
+		reshape(getRect().getWidth(), getRect().getHeight(), TRUE);
+	}
+
 	// Constrain children to be entirely on the screen
 	for ( child_list_const_iter_t child_it = getChildList()->begin(); child_it != getChildList()->end(); ++child_it)
 	{
@@ -2643,6 +2678,8 @@ void LLFloaterView::refresh()
 	}
 }
 
+const S32 FLOATER_MIN_VISIBLE_PIXELS = 16;
+
 void LLFloaterView::adjustToFitScreen(LLFloater* floater, BOOL allow_partial_outside)
 {
 	if (floater->getParent() != this)
@@ -2696,7 +2733,7 @@ void LLFloaterView::adjustToFitScreen(LLFloater* floater, BOOL allow_partial_out
 	}
 
 	// move window fully onscreen
-	if (floater->translateIntoRect( getSnapRect(), allow_partial_outside ))
+	if (floater->translateIntoRect( getSnapRect(), allow_partial_outside ? FLOATER_MIN_VISIBLE_PIXELS : S32_MAX ))
 	{
 		floater->clearSnapTarget();
 	}
@@ -2910,9 +2947,11 @@ void LLFloater::setInstanceName(const std::string& name)
 		std::string ctrl_name = getControlName(mInstanceName, mKey);
 
 		// save_rect and save_visibility only apply to registered floaters
-		if (!mRectControl.empty())
+		if (mSaveRect)
 		{
 			mRectControl = LLFloaterReg::declareRectControl(ctrl_name);
+			mPosXControl = LLFloaterReg::declarePosXControl(ctrl_name);
+			mPosYControl = LLFloaterReg::declarePosYControl(ctrl_name);
 		}
 		if (!mVisibilityControl.empty())
 		{
@@ -2968,6 +3007,12 @@ void LLFloater::initFromParams(const LLFloater::Params& p)
 	 // control_name, tab_stop, focus_lost_callback, initial_value, rect, enabled, visible
 	LLPanel::initFromParams(p);
 
+	// override any follows flags
+	if (mPositioning != LLFloaterEnums::POSITIONING_SPECIFIED)
+	{
+		setFollows(FOLLOWS_NONE);
+	}
+
 	mTitle = p.title;
 	mShortTitle = p.short_title;
 	applyTitle();
@@ -2985,14 +3030,9 @@ void LLFloater::initFromParams(const LLFloater::Params& p)
 	mSingleInstance = p.single_instance;
 	mReuseInstance = p.reuse_instance.isProvided() ? p.reuse_instance : p.single_instance;
 
-	mOpenPositioning = p.open_positioning;
-	mSpecifiedLeft = p.specified_left;
-	mSpecifiedBottom = p.specified_bottom;
+	mPositioning = p.positioning;
 
-	if (p.save_rect && mRectControl.empty())
-	{
-		mRectControl = "t"; // flag to build mRectControl name once mInstanceName is set
-	}
+	mSaveRect = p.save_rect;
 	if (p.save_visibility)
 	{
 		mVisibilityControl = "t"; // flag to build mVisibilityControl name once mInstanceName is set
@@ -3107,7 +3147,7 @@ bool LLFloater::initFloaterXML(LLXMLNodePtr node, LLView *parent, const std::str
 		params.rect.left.set(0);
 	}
 	params.from_xui = true;
-	applyXUILayout(params, parent);
+	applyXUILayout(params, parent, parent == gFloaterView ? gFloaterView->getSnapRect() : parent->getLocalRect());
  	initFromParams(params);
 
 	initFloater(params);
@@ -3266,5 +3306,140 @@ void LLFloater::stackWith(LLFloater& other)
 	next_rect.setLeftTopAndSize(next_rect.mLeft, next_rect.mTop, getRect().getWidth(), getRect().getHeight());
 	
 	setShape(next_rect);
+
+	if (!other.getHost())
+	{
+		other.mPositioning = LLFloaterEnums::POSITIONING_CASCADE_GROUP;
+		other.setFollows(FOLLOWS_LEFT | FOLLOWS_TOP);
+	}
+}
+
+void LLFloater::applyRelativePosition()
+{
+	LLRect snap_rect = gFloaterView->getSnapRect();
+	LLRect floater_view_screen_rect = gFloaterView->calcScreenRect();
+	snap_rect.translate(floater_view_screen_rect.mLeft, floater_view_screen_rect.mBottom);
+	LLRect floater_screen_rect = calcScreenRect();
+
+	LLCoordGL new_center = mPosition.convert();
+	LLCoordGL cur_center(floater_screen_rect.getCenterX(), floater_screen_rect.getCenterY());
+	translate(new_center.mX - cur_center.mX, new_center.mY - cur_center.mY);
 }
 
+
+LLCoordFloater::LLCoordFloater(F32 x, F32 y, LLFloater& floater)
+:	coord_t((S32)x, (S32)y)
+{
+	mFloater = floater.getHandle();
+}
+
+
+LLCoordFloater::LLCoordFloater(const LLCoordCommon& other, LLFloater& floater)
+{
+	mFloater = floater.getHandle();
+	convertFromCommon(other);
+}
+
+LLCoordFloater& LLCoordFloater::operator=(const LLCoordFloater& other)
+{
+	mFloater = other.mFloater;
+	coord_t::operator =(other);
+	return *this;
+}
+
+void LLCoordFloater::setFloater(LLFloater& floater)
+{
+	mFloater = floater.getHandle();
+}
+
+bool LLCoordFloater::operator==(const LLCoordFloater& other) const 
+{ 
+	return mX == other.mX && mY == other.mY && mFloater == other.mFloater; 
+}
+
+LLCoordCommon LL_COORD_FLOATER::convertToCommon() const
+{
+	const LLCoordFloater& self = static_cast<const LLCoordFloater&>(LLCoordFloater::getTypedCoords(*this));
+
+	LLRect snap_rect = gFloaterView->getSnapRect();
+	LLRect floater_view_screen_rect = gFloaterView->calcScreenRect();
+	snap_rect.translate(floater_view_screen_rect.mLeft, floater_view_screen_rect.mBottom);
+
+	LLFloater* floaterp = mFloater.get();
+	S32 floater_width = floaterp ? floaterp->getRect().getWidth() : 0;
+	S32 floater_height = floaterp ? floaterp->getRect().getHeight() : 0;
+	LLCoordCommon out;
+	if (self.mX < -0.5f)
+	{
+		out.mX = llround(rescale(self.mX, -1.f, -0.5f, snap_rect.mLeft - (floater_width - FLOATER_MIN_VISIBLE_PIXELS), snap_rect.mLeft));
+	}
+	else if (self.mX > 0.5f)
+	{
+		out.mX = llround(rescale(self.mX, 0.5f, 1.f, snap_rect.mRight - floater_width, snap_rect.mRight - FLOATER_MIN_VISIBLE_PIXELS));
+	}
+	else
+	{
+		out.mX = llround(rescale(self.mX, -0.5f, 0.5f, snap_rect.mLeft, snap_rect.mRight - floater_width));
+	}
+
+	if (self.mY < -0.5f)
+	{
+		out.mY = llround(rescale(self.mY, -1.f, -0.5f, snap_rect.mBottom - (floater_height - FLOATER_MIN_VISIBLE_PIXELS), snap_rect.mBottom));
+	}
+	else if (self.mY > 0.5f)
+	{
+		out.mY = llround(rescale(self.mY, 0.5f, 1.f, snap_rect.mTop - floater_height, snap_rect.mTop - FLOATER_MIN_VISIBLE_PIXELS));
+	}
+	else
+	{
+		out.mY = llround(rescale(self.mY, -0.5f, 0.5f, snap_rect.mBottom, snap_rect.mTop - floater_height));
+	}
+
+	// return center point instead of lower left
+	out.mX += floater_width / 2;
+	out.mY += floater_height / 2;
+
+	return out;
+}
+
+void LL_COORD_FLOATER::convertFromCommon(const LLCoordCommon& from)
+{
+	LLCoordFloater& self = static_cast<LLCoordFloater&>(LLCoordFloater::getTypedCoords(*this));
+	LLRect snap_rect = gFloaterView->getSnapRect();
+	LLRect floater_view_screen_rect = gFloaterView->calcScreenRect();
+	snap_rect.translate(floater_view_screen_rect.mLeft, floater_view_screen_rect.mBottom);
+
+
+	LLFloater* floaterp = mFloater.get();
+	S32 floater_width = floaterp ? floaterp->getRect().getWidth() : 0;
+	S32 floater_height = floaterp ? floaterp->getRect().getHeight() : 0;
+
+	S32 from_x = from.mX - floater_width / 2;
+	S32 from_y = from.mY - floater_height / 2;
+
+	if (from_x < snap_rect.mLeft)
+	{
+		self.mX = rescale(from_x, snap_rect.mLeft - (floater_width - FLOATER_MIN_VISIBLE_PIXELS), snap_rect.mLeft, -1.f, -0.5f);
+	}
+	else if (from_x + floater_width > snap_rect.mRight)
+	{
+		self.mX = rescale(from_x, snap_rect.mRight - floater_width, snap_rect.mRight - FLOATER_MIN_VISIBLE_PIXELS, 0.5f, 1.f);
+	}
+	else
+	{
+		self.mX = rescale(from_x, snap_rect.mLeft, snap_rect.mRight - floater_width, -0.5f, 0.5f);
+	}
+
+	if (from_y < snap_rect.mBottom)
+	{
+		self.mY = rescale(from_y, snap_rect.mBottom - (floater_height - FLOATER_MIN_VISIBLE_PIXELS), snap_rect.mBottom, -1.f, -0.5f);
+	}
+	else if (from_y + floater_height > snap_rect.mTop)
+	{
+		self.mY = rescale(from_y, snap_rect.mTop - floater_height, snap_rect.mTop - FLOATER_MIN_VISIBLE_PIXELS, 0.5f, 1.f);
+	}
+	else
+	{
+		self.mY = rescale(from_y, snap_rect.mBottom, snap_rect.mTop - floater_height, -0.5f, 0.5f);
+	}
+}
diff --git a/indra/llui/llfloater.h b/indra/llui/llfloater.h
index 73e9c9e831..64d6dcea04 100644
--- a/indra/llui/llfloater.h
+++ b/indra/llui/llfloater.h
@@ -64,12 +64,12 @@ namespace LLFloaterEnums
 {
 	enum EOpenPositioning
 	{
-		OPEN_POSITIONING_NONE,
-		OPEN_POSITIONING_CASCADING,
-		OPEN_POSITIONING_CASCADE_GROUP,
-		OPEN_POSITIONING_CENTERED,
-		OPEN_POSITIONING_SPECIFIED,
-		OPEN_POSITIONING_COUNT
+		POSITIONING_RELATIVE,
+		POSITIONING_CASCADING,
+		POSITIONING_CASCADE_GROUP,
+		POSITIONING_CENTERED,
+		POSITIONING_SPECIFIED,
+		POSITIONING_COUNT
 	};
 }
 
@@ -82,8 +82,39 @@ namespace LLInitParam
 	};
 }
 
+struct LL_COORD_FLOATER
+{
+	typedef F32 value_t;
+
+	LLCoordCommon convertToCommon() const;
+	void convertFromCommon(const LLCoordCommon& from);
+protected:
+	LLHandle<LLFloater> mFloater;
+};
+
+struct LLCoordFloater : LLCoord<LL_COORD_FLOATER>
+{
+	typedef LLCoord<LL_COORD_FLOATER> coord_t;
+
+	LLCoordFloater() {}
+	LLCoordFloater(F32 x, F32 y, LLFloater& floater);
+	LLCoordFloater(const LLCoordCommon& other, LLFloater& floater);
+
+	LLCoordFloater& operator=(const LLCoordCommon& other)
+	{
+		convertFromCommon(other);
+		return *this;
+	}
 
-class LLFloater : public LLPanel
+	LLCoordFloater& operator=(const LLCoordFloater& other);
+
+	bool operator==(const LLCoordFloater& other) const;
+	bool operator!=(const LLCoordFloater& other) const { return !(*this == other); }
+
+	void setFloater(LLFloater& floater);
+};
+
+class LLFloater : public LLPanel, public LLInstanceTracker<LLFloater>
 {
 	friend class LLFloaterView;
 	friend class LLFloaterReg;
@@ -132,10 +163,7 @@ public:
 								can_dock,
 								show_title;
 		
-		Optional<LLFloaterEnums::EOpenPositioning>	open_positioning;
-		Optional<S32>								specified_left;
-		Optional<S32>								specified_bottom;
-
+		Optional<LLFloaterEnums::EOpenPositioning>	positioning;
 		
 		Optional<S32>			header_height,
 								legacy_header_height; // HACK see initFromXML()
@@ -156,6 +184,8 @@ public:
 		
 		Optional<CommitCallbackParam> open_callback,
 									  close_callback;
+
+		Ignored					follows;
 		
 		Params();
 	};
@@ -182,7 +212,7 @@ public:
 	bool initFloaterXML(LLXMLNodePtr node, LLView *parent, const std::string& filename, LLXMLNodePtr output_node = NULL);
 
 	/*virtual*/ void handleReshape(const LLRect& new_rect, bool by_user = false);
-	/*virtual*/ BOOL canSnapTo(const LLView* other_view);
+	/*virtual*/ BOOL canSnapTo(const LLView* other_view); 
 	/*virtual*/ void setSnappedTo(const LLView* snap_view);
 	/*virtual*/ void setFocus( BOOL b );
 	/*virtual*/ void setIsChrome(BOOL is_chrome);
@@ -234,12 +264,11 @@ public:
 	void			setCanTearOff(BOOL can_tear_off);
 	virtual void	setCanResize(BOOL can_resize);
 	void			setCanDrag(BOOL can_drag);
+	bool			getCanDrag();
 	void			setHost(LLMultiFloater* host);
 	BOOL			isResizable() const				{ return mResizable; }
 	void			setResizeLimits( S32 min_width, S32 min_height );
 	void			getResizeLimits( S32* min_width, S32* min_height ) { *min_width = mMinWidth; *min_height = mMinHeight; }
-	LLRect			getSavedRect() const;
-	bool			hasSavedRect() const;
 
 	static std::string		getControlName(const std::string& name, const LLSD& key);
 	static LLControlGroup*	getControlGroup();
@@ -282,7 +311,7 @@ public:
 	void			clearSnapTarget() { mSnappedTo.markDead(); }
 	LLHandle<LLFloater>	getSnapTarget() const { return mSnappedTo; }
 
-	LLHandle<LLFloater> getHandle() const { return mHandle; }
+	LLHandle<LLFloater> getHandle() const { return getDerivedHandle<LLFloater>(); }
 	const LLSD& 	getKey() { return mKey; }
 	virtual bool	matchesKey(const LLSD& key) { return mSingleInstance || KeyCompare::equate(key, mKey); }
 	
@@ -321,7 +350,7 @@ public:
 		
 	void			enableResizeCtrls(bool enable, bool width = true, bool height = true);
 
-	bool			isPositioning(LLFloaterEnums::EOpenPositioning p) const { return (p == mOpenPositioning); }
+	bool			isPositioning(LLFloaterEnums::EOpenPositioning p) const { return (p == mPositioning); }
 protected:
 	void			applyControlsAndPosition(LLFloater* other);
 
@@ -329,7 +358,9 @@ protected:
 
 	virtual bool	applyRectControl();
 	bool			applyDockState();
-	void			applyPositioning(LLFloater* other);
+	void			applyPositioning(LLFloater* other, bool on_open);
+	void			applyRelativePosition();
+
 	void			storeRectControl();
 	void			storeVisibilityControl();
 	void			storeDockStateControl();
@@ -393,7 +424,10 @@ public:
 	commit_signal_t* mMinimizeSignal;
 
 protected:
+	bool			mSaveRect;
 	std::string		mRectControl;
+	std::string		mPosXControl;
+	std::string		mPosYControl;
 	std::string		mVisibilityControl;
 	std::string		mDocStateControl;
 	LLSD			mKey;				// Key used for retrieving instances; set (for now) by LLFLoaterReg
@@ -419,9 +453,8 @@ private:
 	BOOL			mDragOnLeft;
 	BOOL			mResizable;
 
-	LLFloaterEnums::EOpenPositioning	mOpenPositioning;
-	S32									mSpecifiedLeft;
-	S32									mSpecifiedBottom;
+	LLFloaterEnums::EOpenPositioning	mPositioning;
+	LLCoordFloater	mPosition;
 	
 	S32				mMinWidth;
 	S32				mMinHeight;
@@ -460,16 +493,9 @@ private:
 	typedef void(*click_callback)(LLFloater*);
 	static click_callback sButtonCallbacks[BUTTON_COUNT];
 
-	typedef std::map<LLHandle<LLFloater>, LLFloater*> handle_map_t;
-	typedef std::map<LLHandle<LLFloater>, LLFloater*>::iterator handle_map_iter_t;
-	static handle_map_t	sFloaterMap;
-
 	BOOL			mHasBeenDraggedWhileMinimized;
 	S32				mPreviousMinimizedBottom;
 	S32				mPreviousMinimizedLeft;
-
-//	LLFloaterNotificationContext* mNotificationContext;
-	LLRootHandle<LLFloater>		mHandle;	
 };
 
 
@@ -537,6 +563,7 @@ public:
 private:
 	void hiddenFloaterClosed(LLFloater* floater);
 
+	LLRect				mLastSnapRect;
 	LLHandle<LLView>	mSnapView;
 	BOOL			mFocusCycleMode;
 	S32				mSnapOffsetBottom;
diff --git a/indra/llui/llfloaterreg.cpp b/indra/llui/llfloaterreg.cpp
index e144b68f5e..9115eb7174 100644
--- a/indra/llui/llfloaterreg.cpp
+++ b/indra/llui/llfloaterreg.cpp
@@ -96,7 +96,9 @@ LLFloater* LLFloaterReg::getLastFloaterCascading()
 		{
 			LLFloater* inst = *iter;
 
-			if (inst->getVisible() && inst->isPositioning(LLFloaterEnums::OPEN_POSITIONING_CASCADING))
+			if (inst->getVisible() 
+				&& (inst->isPositioning(LLFloaterEnums::POSITIONING_CASCADING)
+					|| inst->isPositioning(LLFloaterEnums::POSITIONING_CASCADE_GROUP)))
 			{
 				if (candidate_rect.mTop > inst->getRect().mTop)
 				{
@@ -358,9 +360,7 @@ void LLFloaterReg::restoreVisibleInstances()
 //static
 std::string LLFloaterReg::getRectControlName(const std::string& name)
 {
-	std::string res = std::string("floater_rect_") + name;
-	LLStringUtil::replaceChar( res, ' ', '_' );
-	return res;
+	return std::string("floater_rect_") + getBaseControlName(name);
 }
 
 //static
@@ -368,19 +368,48 @@ std::string LLFloaterReg::declareRectControl(const std::string& name)
 {
 	std::string controlname = getRectControlName(name);
 	LLFloater::getControlGroup()->declareRect(controlname, LLRect(),
-												 llformat("Window Position and Size for %s", name.c_str()),
+												 llformat("Window Size for %s", name.c_str()),
 												 TRUE);
 	return controlname;
 }
 
+std::string LLFloaterReg::declarePosXControl(const std::string& name)
+{
+	std::string controlname = std::string("floater_pos_") + getBaseControlName(name) + "_x";
+	LLFloater::getControlGroup()->declareF32(controlname, 
+											10.f,
+											llformat("Window X Position for %s", name.c_str()),
+											TRUE);
+	return controlname;
+}
+
+std::string LLFloaterReg::declarePosYControl(const std::string& name)
+{
+	std::string controlname = std::string("floater_pos_") + getBaseControlName(name) + "_y";
+	LLFloater::getControlGroup()->declareF32(controlname,
+											10.f,
+											llformat("Window Y Position for %s", name.c_str()),
+											TRUE);
+
+	return controlname;
+}
+
+
 //static
 std::string LLFloaterReg::getVisibilityControlName(const std::string& name)
 {
-	std::string res = std::string("floater_vis_") + name;
+	return std::string("floater_vis_") + getBaseControlName(name);
+}
+
+//static 
+std::string LLFloaterReg::getBaseControlName(const std::string& name)
+{
+	std::string res(name);
 	LLStringUtil::replaceChar( res, ' ', '_' );
 	return res;
 }
 
+
 //static
 std::string LLFloaterReg::declareVisibilityControl(const std::string& name)
 {
diff --git a/indra/llui/llfloaterreg.h b/indra/llui/llfloaterreg.h
index 534cf8b40a..a1e1f8a988 100644
--- a/indra/llui/llfloaterreg.h
+++ b/indra/llui/llfloaterreg.h
@@ -115,9 +115,11 @@ public:
 	// Control Variables
 	static std::string getRectControlName(const std::string& name);
 	static std::string declareRectControl(const std::string& name);
+	static std::string declarePosXControl(const std::string& name);
+	static std::string declarePosYControl(const std::string& name);
 	static std::string getVisibilityControlName(const std::string& name);
 	static std::string declareVisibilityControl(const std::string& name);
-
+	static std::string getBaseControlName(const std::string& name);
 	static std::string declareDockStateControl(const std::string& name);
 	static std::string getDockStateControlName(const std::string& name);
 
diff --git a/indra/llui/llhandle.h b/indra/llui/llhandle.h
index 8c000eee48..37c657dd92 100644
--- a/indra/llui/llhandle.h
+++ b/indra/llui/llhandle.h
@@ -28,17 +28,18 @@
 #define LLHANDLE_H
 
 #include "llpointer.h"
+#include <boost/type_traits/is_convertible.hpp>
+#include <boost/utility/enable_if.hpp>
 
-template <typename T>
 class LLTombStone : public LLRefCount
 {
 public:
-	LLTombStone(T* target = NULL) : mTarget(target) {}
+	LLTombStone(void* target = NULL) : mTarget(target) {}
 
-	void setTarget(T* target) { mTarget = target; }
-	T* getTarget() const { return mTarget; }
+	void setTarget(void* target) { mTarget = target; }
+	void* getTarget() const { return mTarget; }
 private:
-	T* mTarget;
+	mutable void* mTarget;
 };
 
 //	LLHandles are used to refer to objects whose lifetime you do not control or influence.  
@@ -53,13 +54,15 @@ private:
 template <typename T>
 class LLHandle
 {
+	template <typename U> friend class LLHandle;
+	template <typename U> friend class LLHandleProvider;
 public:
 	LLHandle() : mTombStone(getDefaultTombStone()) {}
-	const LLHandle<T>& operator =(const LLHandle<T>& other)  
-	{ 
-		mTombStone = other.mTombStone;
-		return *this; 
-	}
+
+	template<typename U>
+	LLHandle(const LLHandle<U>& other, typename boost::enable_if< typename boost::is_convertible<U*, T*> >::type* dummy = 0)
+	: mTombStone(other.mTombStone)
+	{}
 
 	bool isDead() const 
 	{ 
@@ -73,7 +76,7 @@ public:
 
 	T* get() const
 	{
-		return mTombStone->getTarget();
+		return reinterpret_cast<T*>(mTombStone->getTarget());
 	}
 
 	friend bool operator== (const LLHandle<T>& lhs, const LLHandle<T>& rhs)
@@ -94,12 +97,13 @@ public:
 	}
 
 protected:
-	LLPointer<LLTombStone<T> > mTombStone;
+	LLPointer<LLTombStone> mTombStone;
 
 private:
-	static LLPointer<LLTombStone<T> >& getDefaultTombStone()
+	typedef T* pointer_t;
+	static LLPointer<LLTombStone>& getDefaultTombStone()
 	{
-		static LLPointer<LLTombStone<T> > sDefaultTombStone = new LLTombStone<T>;
+		static LLPointer<LLTombStone> sDefaultTombStone = new LLTombStone;
 		return sDefaultTombStone;
 	}
 };
@@ -108,23 +112,26 @@ template <typename T>
 class LLRootHandle : public LLHandle<T>
 {
 public:
+	typedef LLRootHandle<T> self_t;
+	typedef LLHandle<T> base_t;
+
 	LLRootHandle(T* object) { bind(object); }
 	LLRootHandle() {};
 	~LLRootHandle() { unbind(); }
 
-	// this is redundant, since a LLRootHandle *is* an LLHandle
-	LLHandle<T> getHandle() { return LLHandle<T>(*this); }
+	// this is redundant, since an LLRootHandle *is* an LLHandle
+	//LLHandle<T> getHandle() { return LLHandle<T>(*this); }
 
 	void bind(T* object) 
 	{ 
 		// unbind existing tombstone
 		if (LLHandle<T>::mTombStone.notNull())
 		{
-			if (LLHandle<T>::mTombStone->getTarget() == object) return;
+			if (LLHandle<T>::mTombStone->getTarget() == (void*)object) return;
 			LLHandle<T>::mTombStone->setTarget(NULL);
 		}
 		// tombstone reference counted, so no paired delete
-		LLHandle<T>::mTombStone = new LLTombStone<T>(object);
+		LLHandle<T>::mTombStone = new LLTombStone((void*)object);
 	}
 
 	void unbind() 
@@ -142,6 +149,15 @@ private:
 template <typename T>
 class LLHandleProvider
 {
+public:
+	LLHandle<T> getHandle() const
+	{ 
+		// perform lazy binding to avoid small tombstone allocations for handle
+		// providers whose handles are never referenced
+		mHandle.bind(static_cast<T*>(const_cast<LLHandleProvider<T>* >(this))); 
+		return mHandle; 
+	}
+
 protected:
 	typedef LLHandle<T> handle_type_t;
 	LLHandleProvider() 
@@ -149,16 +165,17 @@ protected:
 		// provided here to enforce T deriving from LLHandleProvider<T>
 	} 
 
-	LLHandle<T> getHandle() 
-	{ 
-		// perform lazy binding to avoid small tombstone allocations for handle
-		// providers whose handles are never referenced
-		mHandle.bind(static_cast<T*>(this)); 
-		return mHandle; 
+	template <typename U>
+	LLHandle<U> getDerivedHandle(typename boost::enable_if< typename boost::is_convertible<U*, T*> >::type* dummy = 0) const
+	{
+		LLHandle<U> downcast_handle;
+		downcast_handle.mTombStone = getHandle().mTombStone;
+		return downcast_handle;
 	}
 
+
 private:
-	LLRootHandle<T> mHandle;
+	mutable LLRootHandle<T> mHandle;
 };
 
 #endif
diff --git a/indra/llui/lllayoutstack.cpp b/indra/llui/lllayoutstack.cpp
index 0e7060e22c..4c730286da 100644
--- a/indra/llui/lllayoutstack.cpp
+++ b/indra/llui/lllayoutstack.cpp
@@ -34,6 +34,10 @@
 #include "llpanel.h"
 #include "llresizebar.h"
 #include "llcriticaldamp.h"
+#include "boost/foreach.hpp"
+
+static const F32 MIN_FRACTIONAL_SIZE = 0.0f;
+static const F32 MAX_FRACTIONAL_SIZE = 1.f;
 
 static LLDefaultChildRegistry::Register<LLLayoutStack> register_layout_stack("layout_stack");
 static LLLayoutStack::LayoutStackRegistry::Register<LLLayoutPanel> register_layout_panel("layout_panel");
@@ -49,39 +53,29 @@ void LLLayoutStack::OrientationNames::declareValues()
 //
 LLLayoutPanel::Params::Params()	
 :	expanded_min_dim("expanded_min_dim", 0),
-	min_dim("min_dim", 0),
-	max_dim("max_dim", S32_MAX),
-	user_resize("user_resize", true),
+	min_dim("min_dim", -1),
+	user_resize("user_resize", false),
 	auto_resize("auto_resize", true)
 {
 	addSynonym(min_dim, "min_width");
 	addSynonym(min_dim, "min_height");
-	addSynonym(max_dim, "max_width");
-	addSynonym(max_dim, "max_height");
 }
 
 LLLayoutPanel::LLLayoutPanel(const Params& p)	
 :	LLPanel(p),
-	mExpandedMinDimSpecified(false),
-	mExpandedMinDim(p.min_dim),
+	mExpandedMinDim(p.expanded_min_dim.isProvided() ? p.expanded_min_dim : p.min_dim),
  	mMinDim(p.min_dim), 
- 	mMaxDim(p.max_dim), 
  	mAutoResize(p.auto_resize),
  	mUserResize(p.user_resize),
 	mCollapsed(FALSE),
 	mCollapseAmt(0.f),
 	mVisibleAmt(1.f), // default to fully visible
 	mResizeBar(NULL),
-	mFractionalSize(0.f),
+	mFractionalSize(MIN_FRACTIONAL_SIZE),
+	mTargetDim(0),
+	mIgnoreReshape(false),
 	mOrientation(LLLayoutStack::HORIZONTAL)
 {
-	// Set the expanded min dim if it is provided, otherwise it gets the p.min_dim value
-	if (p.expanded_min_dim.isProvided())
-	{
-		mExpandedMinDimSpecified = true;
-		mExpandedMinDim = p.expanded_min_dim();
-	}
-	
 	// panels initialized as hidden should not start out partially visible
 	if (!getVisible())
 	{
@@ -103,33 +97,111 @@ LLLayoutPanel::~LLLayoutPanel()
 	mResizeBar = NULL;
 }
 
-void LLLayoutPanel::reshape(S32 width, S32 height, BOOL called_from_parent)
+F32 LLLayoutPanel::getAutoResizeFactor() const
+{
+	return mVisibleAmt * (1.f - mCollapseAmt);
+}
+ 
+F32 LLLayoutPanel::getVisibleAmount() const
+{
+	return mVisibleAmt;
+}
+
+S32 LLLayoutPanel::getLayoutDim() const
+{
+	return llround((F32)((mOrientation == LLLayoutStack::HORIZONTAL)
+					? getRect().getWidth()
+					: getRect().getHeight()));
+}
+
+S32 LLLayoutPanel::getTargetDim() const
+{
+	return mTargetDim;
+}
+
+void LLLayoutPanel::setTargetDim(S32 value)
 {
+	LLRect new_rect(getRect());
 	if (mOrientation == LLLayoutStack::HORIZONTAL)
 	{
-		mFractionalSize += width - llround(mFractionalSize);
+		new_rect.mRight = new_rect.mLeft + value;
 	}
 	else
 	{
-		mFractionalSize += height - llround(mFractionalSize);
+		new_rect.mTop = new_rect.mBottom + value;
 	}
-	LLPanel::reshape(width, height, called_from_parent);
+	setShape(new_rect, true);
 }
 
-F32 LLLayoutPanel::getCollapseFactor()
+S32 LLLayoutPanel::getVisibleDim() const
 {
-	if (mOrientation == LLLayoutStack::HORIZONTAL)
+	F32 min_dim = getRelevantMinDim();
+	return llround(mVisibleAmt
+					* (min_dim
+						+ (((F32)mTargetDim - min_dim) * (1.f - mCollapseAmt))));
+}
+ 
+void LLLayoutPanel::setOrientation( LLLayoutStack::ELayoutOrientation orientation )
+{
+	mOrientation = orientation;
+	S32 layout_dim = llround((F32)((mOrientation == LLLayoutStack::HORIZONTAL)
+		? getRect().getWidth()
+		: getRect().getHeight()));
+
+	if (mAutoResize == FALSE 
+		&& mUserResize == TRUE 
+		&& mMinDim == -1 )
 	{
-		F32 collapse_amt = 
-			clamp_rescale(mCollapseAmt, 0.f, 1.f, 1.f, (F32)getRelevantMinDim() / (F32)llmax(1, getRect().getWidth()));
-		return mVisibleAmt * collapse_amt;
+		setMinDim(layout_dim);
 	}
-	else
+	mTargetDim = llmax(layout_dim, getMinDim());
+}
+ 
+void LLLayoutPanel::setVisible( BOOL visible )
+{
+	if (visible != getVisible())
 	{
-		F32 collapse_amt = 
-			clamp_rescale(mCollapseAmt, 0.f, 1.f, 1.f, llmin(1.f, (F32)getRelevantMinDim() / (F32)llmax(1, getRect().getHeight())));
-		return mVisibleAmt * collapse_amt;
+		LLLayoutStack* stackp = dynamic_cast<LLLayoutStack*>(getParent());
+		if (stackp)
+		{
+			stackp->mNeedsLayout = true;
+		}
 	}
+	LLPanel::setVisible(visible);
+}
+
+void LLLayoutPanel::reshape( S32 width, S32 height, BOOL called_from_parent /*= TRUE*/ )
+{
+	if (width == getRect().getWidth() && height == getRect().getHeight()) return;
+
+	if (!mIgnoreReshape && mAutoResize == false)
+	{
+		mTargetDim = (mOrientation == LLLayoutStack::HORIZONTAL) ? width : height;
+		LLLayoutStack* stackp = dynamic_cast<LLLayoutStack*>(getParent());
+		if (stackp)
+		{
+			stackp->mNeedsLayout = true;
+		}
+	}
+	LLPanel::reshape(width, height, called_from_parent);
+}
+
+void LLLayoutPanel::handleReshape(const LLRect& new_rect, bool by_user)
+{
+	LLLayoutStack* stackp = dynamic_cast<LLLayoutStack*>(getParent());
+	if (stackp)
+	{
+		if (by_user)
+		{	// tell layout stack to account for new shape
+			
+			// make sure that panels have already been auto resized
+			stackp->updateLayout();
+			// now apply requested size to panel
+			stackp->updatePanelRect(this, new_rect);
+		}
+		stackp->mNeedsLayout = true;
+	}
+	LLPanel::handleReshape(new_rect, by_user);
 }
 
 //
@@ -142,20 +214,21 @@ LLLayoutStack::Params::Params()
 	clip("clip", true),
 	open_time_constant("open_time_constant", 0.02f),
 	close_time_constant("close_time_constant", 0.03f),
+	resize_bar_overlap("resize_bar_overlap", 1),
 	border_size("border_size", LLCachedControl<S32>(*LLUI::sSettingGroups["config"], "UIResizeBarHeight", 0))
 {}
 
 LLLayoutStack::LLLayoutStack(const LLLayoutStack::Params& p) 
 :	LLView(p),
-	mMinWidth(0),
-	mMinHeight(0),
 	mPanelSpacing(p.border_size),
 	mOrientation(p.orientation),
 	mAnimate(p.animate),
 	mAnimatedThisFrame(false),
+	mNeedsLayout(true),
 	mClip(p.clip),
 	mOpenTimeConstant(p.open_time_constant),
-	mCloseTimeConstant(p.close_time_constant)
+	mCloseTimeConstant(p.close_time_constant),
+	mResizeBarOverlap(p.resize_bar_overlap)
 {}
 
 LLLayoutStack::~LLLayoutStack()
@@ -169,28 +242,27 @@ void LLLayoutStack::draw()
 {
 	updateLayout();
 
-	e_panel_list_t::iterator panel_it;
-	for (panel_it = mPanels.begin(); panel_it != mPanels.end(); ++panel_it)
+	// always clip to stack itself
+	LLLocalClipRect clip(getLocalRect());
+	BOOST_FOREACH(LLLayoutPanel* panelp, mPanels)
 	{
 		// clip to layout rectangle, not bounding rectangle
-		LLRect clip_rect = (*panel_it)->getRect();
+		LLRect clip_rect = panelp->getRect();
 		// scale clipping rectangle by visible amount
 		if (mOrientation == HORIZONTAL)
 		{
-			clip_rect.mRight = clip_rect.mLeft + llround((F32)clip_rect.getWidth() * (*panel_it)->getCollapseFactor());
+			clip_rect.mRight = clip_rect.mLeft + panelp->getVisibleDim();
 		}
 		else
 		{
-			clip_rect.mBottom = clip_rect.mTop - llround((F32)clip_rect.getHeight() * (*panel_it)->getCollapseFactor());
+			clip_rect.mBottom = clip_rect.mTop - panelp->getVisibleDim();
 		}
 
-		LLPanel* panelp = (*panel_it);
-
-		LLLocalClipRect clip(clip_rect, mClip);
-		// only force drawing invisible children if visible amount is non-zero
-		drawChild(panelp, 0, 0, !clip_rect.isEmpty());
+		{LLLocalClipRect clip(clip_rect, mClip);
+			// only force drawing invisible children if visible amount is non-zero
+			drawChild(panelp, 0, 0, !clip_rect.isEmpty());
+		}
 	}
-	mAnimatedThisFrame = false;
 }
 
 void LLLayoutStack::removeChild(LLView* view)
@@ -201,12 +273,10 @@ void LLLayoutStack::removeChild(LLView* view)
 	{
 		mPanels.erase(std::find(mPanels.begin(), mPanels.end(), embedded_panelp));
 		delete embedded_panelp;
+		updateFractionalSizes();
+		mNeedsLayout = true;
 	}
 
-	// need to update resizebars
-
-	calcMinExtents();
-
 	LLView::removeChild(view);
 }
 
@@ -221,29 +291,15 @@ bool LLLayoutStack::addChild(LLView* child, S32 tab_group)
 	LLLayoutPanel* panelp = dynamic_cast<LLLayoutPanel*>(child);
 	if (panelp)
 	{
-		panelp->mFractionalSize = (mOrientation == HORIZONTAL)
-									? panelp->getRect().getWidth()
-									: panelp->getRect().getHeight();
 		panelp->setOrientation(mOrientation);
 		mPanels.push_back(panelp);
+		createResizeBar(panelp);
+		mNeedsLayout = true;
 	}
-	return LLView::addChild(child, tab_group);
-}
-
-void LLLayoutStack::movePanel(LLPanel* panel_to_move, LLPanel* target_panel, bool move_to_front)
-{
-	LLLayoutPanel* embedded_panel_to_move = findEmbeddedPanel(panel_to_move);
-	LLLayoutPanel* embedded_target_panel = move_to_front ? *mPanels.begin() : findEmbeddedPanel(target_panel);
+	BOOL result = LLView::addChild(child, tab_group);
 
-	if (!embedded_panel_to_move || !embedded_target_panel || embedded_panel_to_move == embedded_target_panel)
-	{
-		llwarns << "One of the panels was not found in stack or NULL was passed instead of valid panel" << llendl;
-		return;
-	}
-	e_panel_list_t::iterator it = std::find(mPanels.begin(), mPanels.end(), embedded_panel_to_move);
-	mPanels.erase(it);
-	it = move_to_front ? mPanels.begin() : std::find(mPanels.begin(), mPanels.end(), embedded_target_panel);
-	mPanels.insert(it, embedded_panel_to_move);
+	updateFractionalSizes();
+	return result;
 }
 
 void LLLayoutStack::addPanel(LLLayoutPanel* panel, EAnimate animate)
@@ -258,84 +314,281 @@ void LLLayoutStack::addPanel(LLLayoutPanel* panel, EAnimate animate)
 	}
 }
 
-void LLLayoutStack::removePanel(LLPanel* panel)
-{
-	removeChild(panel);
-}
-
 void LLLayoutStack::collapsePanel(LLPanel* panel, BOOL collapsed)
 {
 	LLLayoutPanel* panel_container = findEmbeddedPanel(panel);
 	if (!panel_container) return;
 
 	panel_container->mCollapsed = collapsed;
+	mNeedsLayout = true;
 }
 
-void LLLayoutStack::updatePanelAutoResize(const std::string& panel_name, BOOL auto_resize)
+static LLFastTimer::DeclareTimer FTM_UPDATE_LAYOUT("Update LayoutStacks");
+
+void LLLayoutStack::updateLayout()
+{	
+	LLFastTimer ft(FTM_UPDATE_LAYOUT);
+
+	if (!mNeedsLayout) return;
+
+	bool continue_animating = animatePanels();
+	F32 total_visible_fraction = 0.f;
+	S32 space_to_distribute = (mOrientation == HORIZONTAL)
+							? getRect().getWidth()
+							: getRect().getHeight();
+
+	// first, assign minimum dimensions
+	LLLayoutPanel* panelp = NULL;
+	BOOST_FOREACH(panelp, mPanels)
+	{
+		if (panelp->mAutoResize)
+		{
+			panelp->mTargetDim = panelp->getRelevantMinDim();
+		}
+		space_to_distribute -= panelp->getVisibleDim() + llround((F32)mPanelSpacing * panelp->getVisibleAmount());
+		total_visible_fraction += panelp->mFractionalSize * panelp->getAutoResizeFactor();
+	}
+
+	llassert(total_visible_fraction < 1.05f);
+
+	// don't need spacing after last panel
+	space_to_distribute += panelp ? llround((F32)mPanelSpacing * panelp->getVisibleAmount()) : 0;
+
+	S32 remaining_space = space_to_distribute;
+	F32 fraction_distributed = 0.f;
+	if (space_to_distribute > 0 && total_visible_fraction > 0.f)
+	{	// give space proportionally to visible auto resize panels
+		BOOST_FOREACH(LLLayoutPanel* panelp, mPanels)
+		{
+			if (panelp->mAutoResize)
+			{
+				F32 fraction_to_distribute = (panelp->mFractionalSize * panelp->getAutoResizeFactor()) / (total_visible_fraction);
+				S32 delta = llround((F32)space_to_distribute * fraction_to_distribute);
+				fraction_distributed += fraction_to_distribute;
+				panelp->mTargetDim += delta;
+				remaining_space -= delta;
+			}
+		}
+	}
+
+	// distribute any left over pixels to non-collapsed, visible panels
+	BOOST_FOREACH(LLLayoutPanel* panelp, mPanels)
+	{
+		if (remaining_space == 0) break;
+
+		if (panelp->mAutoResize 
+			&& !panelp->mCollapsed 
+			&& panelp->getVisible())
+		{
+			S32 space_for_panel = remaining_space > 0 ? 1 : -1;
+			panelp->mTargetDim += space_for_panel;
+			remaining_space -= space_for_panel;
+		}
+	}
+
+	F32 cur_pos = (mOrientation == HORIZONTAL) ? 0.f : (F32)getRect().getHeight();
+
+	BOOST_FOREACH(LLLayoutPanel* panelp, mPanels)
+	{
+		F32 panel_dim = llmax(panelp->getExpandedMinDim(), panelp->mTargetDim);
+		F32 panel_visible_dim = panelp->getVisibleDim();
+
+		LLRect panel_rect;
+		if (mOrientation == HORIZONTAL)
+		{
+			panel_rect.setLeftTopAndSize(llround(cur_pos),
+										getRect().getHeight(),
+										llround(panel_dim),
+										getRect().getHeight());
+		}
+		else
+		{
+			panel_rect.setLeftTopAndSize(0,
+										llround(cur_pos),
+										getRect().getWidth(),
+										llround(panel_dim));
+		}
+		panelp->setIgnoreReshape(true);
+		panelp->setShape(panel_rect);
+		panelp->setIgnoreReshape(false);
+
+		LLRect resize_bar_rect(panel_rect);
+
+		F32 panel_spacing = (F32)mPanelSpacing * panelp->getVisibleAmount();
+		if (mOrientation == HORIZONTAL)
+		{
+			resize_bar_rect.mLeft = panel_rect.mRight - mResizeBarOverlap;
+			resize_bar_rect.mRight = panel_rect.mRight + (S32)(llround(panel_spacing)) + mResizeBarOverlap;
+
+			cur_pos += panel_visible_dim + panel_spacing;
+		}
+		else //VERTICAL
+		{
+			resize_bar_rect.mTop = panel_rect.mBottom + mResizeBarOverlap;
+			resize_bar_rect.mBottom = panel_rect.mBottom - (S32)(llround(panel_spacing)) - mResizeBarOverlap;
+
+			cur_pos -= panel_visible_dim + panel_spacing;
+		}
+		panelp->mResizeBar->setShape(resize_bar_rect);
+	}
+
+	updateResizeBarLimits();
+
+	// clear animation flag at end, since panel resizes will set it
+	// and leave it set if there is any animation in progress
+	mNeedsLayout = continue_animating;
+} // end LLLayoutStack::updateLayout
+
+LLLayoutPanel* LLLayoutStack::findEmbeddedPanel(LLPanel* panelp) const
 {
-	LLLayoutPanel* panel = findEmbeddedPanelByName(panel_name);
+	if (!panelp) return NULL;
 
-	if (panel)
+	e_panel_list_t::const_iterator panel_it;
+	BOOST_FOREACH(LLLayoutPanel* p, mPanels)
 	{
-		panel->mAutoResize = auto_resize;
+		if (p == panelp)
+		{
+			return p;
+		}
 	}
+	return NULL;
 }
 
-void LLLayoutStack::setPanelUserResize(const std::string& panel_name, BOOL user_resize)
+LLLayoutPanel* LLLayoutStack::findEmbeddedPanelByName(const std::string& name) const
 {
-	LLLayoutPanel* panel = findEmbeddedPanelByName(panel_name);
+	LLLayoutPanel* result = NULL;
 
-	if (panel)
+	BOOST_FOREACH(LLLayoutPanel* p, mPanels)
 	{
-		panel->mUserResize = user_resize;
+		if (p->getName() == name)
+		{
+			result = p;
+			break;
+		}
 	}
+
+	return result;
 }
 
-bool LLLayoutStack::getPanelMinSize(const std::string& panel_name, S32* min_dimp)
+void LLLayoutStack::createResizeBar(LLLayoutPanel* panelp)
 {
-	LLLayoutPanel* panel = findEmbeddedPanelByName(panel_name);
+	BOOST_FOREACH(LLLayoutPanel* lp, mPanels)
+	{
+		if (lp->mResizeBar == NULL)
+		{
+			LLResizeBar::Side side = (mOrientation == HORIZONTAL) ? LLResizeBar::RIGHT : LLResizeBar::BOTTOM;
+			LLRect resize_bar_rect = getRect();
 
-	if (panel && min_dimp)
+			LLResizeBar::Params resize_params;
+			resize_params.name("resize");
+			resize_params.resizing_view(lp);
+			resize_params.min_size(lp->getRelevantMinDim());
+			resize_params.side(side);
+			resize_params.snapping_enabled(false);
+			LLResizeBar* resize_bar = LLUICtrlFactory::create<LLResizeBar>(resize_params);
+			lp->mResizeBar = resize_bar;
+			LLView::addChild(resize_bar, 0);
+		}
+	}
+	// bring all resize bars to the front so that they are clickable even over the panels
+	// with a bit of overlap
+	for (e_panel_list_t::iterator panel_it = mPanels.begin(); panel_it != mPanels.end(); ++panel_it)
 	{
-		*min_dimp = panel->getRelevantMinDim();
+		LLResizeBar* resize_barp = (*panel_it)->mResizeBar;
+		sendChildToFront(resize_barp);
 	}
+}
 
-	return NULL != panel;
+// update layout stack animations, etc. once per frame
+// NOTE: we use this to size world view based on animating UI, *before* we draw the UI
+// we might still need to call updateLayout during UI draw phase, in case UI elements
+// are resizing themselves dynamically
+//static 
+void LLLayoutStack::updateClass()
+{
+	for (instance_iter it = beginInstances(); it != endInstances(); ++it)
+	{
+		it->updateLayout();
+		it->mAnimatedThisFrame = false;
+	}
 }
 
-bool LLLayoutStack::getPanelMaxSize(const std::string& panel_name, S32* max_dimp)
+void LLLayoutStack::updateFractionalSizes()
 {
-	LLLayoutPanel* panel = findEmbeddedPanelByName(panel_name);
+	F32 total_resizable_dim = 0.f;
 
-	if (panel)
+	BOOST_FOREACH(LLLayoutPanel* panelp, mPanels)
 	{
-		if (max_dimp) *max_dimp = panel->mMaxDim;
+		if (panelp->mAutoResize)
+		{
+			total_resizable_dim += llmax(0, panelp->getLayoutDim() - panelp->getRelevantMinDim());
+		}
 	}
 
-	return NULL != panel;
+	BOOST_FOREACH(LLLayoutPanel* panelp, mPanels)
+	{
+		if (panelp->mAutoResize)
+		{
+			F32 panel_resizable_dim = llmax(MIN_FRACTIONAL_SIZE, (F32)(panelp->getLayoutDim() - panelp->getRelevantMinDim()));
+			panelp->mFractionalSize = panel_resizable_dim > 0.f 
+				? llclamp(panel_resizable_dim / total_resizable_dim, MIN_FRACTIONAL_SIZE, MAX_FRACTIONAL_SIZE)
+				: MIN_FRACTIONAL_SIZE;
+			llassert(!llisnan(panelp->mFractionalSize));
+		}
+	}
+
+	normalizeFractionalSizes();
 }
 
-static LLFastTimer::DeclareTimer FTM_UPDATE_LAYOUT("Update LayoutStacks");
-void LLLayoutStack::updateLayout(BOOL force_resize)
+
+void LLLayoutStack::normalizeFractionalSizes()
 {
-	LLFastTimer ft(FTM_UPDATE_LAYOUT);
-	static LLUICachedControl<S32> resize_bar_overlap ("UIResizeBarOverlap", 0);
-	calcMinExtents();
-	createResizeBars();
+	S32 num_auto_resize_panels = 0;
+	F32 total_fractional_size = 0.f;
+	
+	BOOST_FOREACH(LLLayoutPanel* panelp, mPanels)
+	{
+		if (panelp->mAutoResize)
+		{
+			total_fractional_size += panelp->mFractionalSize;
+			num_auto_resize_panels++;
+		}
+	}
 
-	// calculate current extents
-	F32 total_size = 0.f;
+	if (total_fractional_size == 0.f)
+	{ // equal distribution
+		BOOST_FOREACH(LLLayoutPanel* panelp, mPanels)
+		{
+			if (panelp->mAutoResize)
+			{
+				panelp->mFractionalSize = MAX_FRACTIONAL_SIZE / (F32)num_auto_resize_panels;
+			}
+		}
+	}
+	else
+	{ // renormalize
+		BOOST_FOREACH(LLLayoutPanel* panelp, mPanels)
+		{
+			if (panelp->mAutoResize)
+			{
+				panelp->mFractionalSize /= total_fractional_size;
+			}
+		}
+	}
+}
 
+bool LLLayoutStack::animatePanels()
+{
+	bool continue_animating = false;
+	
 	//
 	// animate visibility
 	//
-	e_panel_list_t::iterator panel_it;
-	for (panel_it = mPanels.begin(); panel_it != mPanels.end();	++panel_it)
+	BOOST_FOREACH(LLLayoutPanel* panelp, mPanels)
 	{
-		LLLayoutPanel* panelp = (*panel_it);
-		if (panelp->getVisible()) 
+		if (panelp->getVisible())
 		{
-			if (mAnimate)
+			if (mAnimate && panelp->mVisibleAmt < 1.f)
 			{
 				if (!mAnimatedThisFrame)
 				{
@@ -345,15 +598,22 @@ void LLLayoutStack::updateLayout(BOOL force_resize)
 						panelp->mVisibleAmt = 1.f;
 					}
 				}
+				
+				mAnimatedThisFrame = true;
+				continue_animating = true;
 			}
 			else
 			{
-				panelp->mVisibleAmt = 1.f;
+				if (panelp->mVisibleAmt != 1.f)
+				{
+					panelp->mVisibleAmt = 1.f;
+					mAnimatedThisFrame = true;
+				}
 			}
 		}
 		else // not visible
 		{
-			if (mAnimate)
+			if (mAnimate && panelp->mVisibleAmt > 0.f)
 			{
 				if (!mAnimatedThisFrame)
 				{
@@ -363,297 +623,235 @@ void LLLayoutStack::updateLayout(BOOL force_resize)
 						panelp->mVisibleAmt = 0.f;
 					}
 				}
+
+				continue_animating = true;
+				mAnimatedThisFrame = true;
 			}
 			else
 			{
-				panelp->mVisibleAmt = 0.f;
+				if (panelp->mVisibleAmt != 0.f)
+				{
+					panelp->mVisibleAmt = 0.f;
+					mAnimatedThisFrame = true;
+				}
 			}
 		}
 
 		F32 collapse_state = panelp->mCollapsed ? 1.f : 0.f;
-		panelp->mCollapseAmt = lerp(panelp->mCollapseAmt, collapse_state, LLCriticalDamp::getInterpolant(mCloseTimeConstant));
-
-        total_size += panelp->mFractionalSize * panelp->getCollapseFactor();
-        // want n-1 panel gaps for n panels
-		if (panel_it != mPanels.begin())
-		{
-			total_size += mPanelSpacing;
-		}
-	}
-
-	S32 num_resizable_panels = 0;
-	F32 shrink_headroom_available = 0.f;
-	F32 shrink_headroom_total = 0.f;
-	for (panel_it = mPanels.begin(); panel_it != mPanels.end(); ++panel_it)
-	{
-		LLLayoutPanel* panelp = (*panel_it);
-
-		// panels that are not fully visible do not count towards shrink headroom
-		if (panelp->getCollapseFactor() < 1.f) 
+		if (panelp->mCollapseAmt != collapse_state)
 		{
-			continue;
-		}
-
-		F32 cur_size = panelp->mFractionalSize;
-		F32 min_size = (F32)panelp->getRelevantMinDim();
-		
-		// if currently resizing a panel or the panel is flagged as not automatically resizing
-		// only track total available headroom, but don't use it for automatic resize logic
-		if (panelp->mResizeBar->hasMouseCapture() 
-			|| (!panelp->mAutoResize 
-				&& !force_resize))
-		{
-			shrink_headroom_total += cur_size - min_size;
-		}
-		else
-		{
-			num_resizable_panels++;
+			if (mAnimate)
+			{
+				if (!mAnimatedThisFrame)
+				{
+					panelp->mCollapseAmt = lerp(panelp->mCollapseAmt, collapse_state, LLCriticalDamp::getInterpolant(mCloseTimeConstant));
+				}
 			
-			shrink_headroom_available += cur_size - min_size;
-			shrink_headroom_total += cur_size - min_size;
-		}
-	}
-
-	// calculate how many pixels need to be distributed among layout panels
-	// positive means panels need to grow, negative means shrink
-	F32 pixels_to_distribute = (mOrientation == HORIZONTAL)
-							? getRect().getWidth() - total_size
-							: getRect().getHeight() - total_size;
-
-	// now we distribute the pixels...
-	F32 cur_x = 0.f;
-	F32 cur_y = (F32)getRect().getHeight();
-
-	for (panel_it = mPanels.begin(); panel_it != mPanels.end(); ++panel_it)
-	{
-		LLLayoutPanel* panelp = (*panel_it);
-
-		F32 min_size = panelp->getRelevantMinDim();
-		F32 delta_size = 0.f;
+				if (llabs(panelp->mCollapseAmt - collapse_state) < 0.001f)
+				{
+					panelp->mCollapseAmt = collapse_state;
+				}
 
-		// if panel can automatically resize (not animating, and resize flag set)...
-		if (panelp->getCollapseFactor() == 1.f 
-			&& (force_resize || panelp->mAutoResize) 
-			&& !panelp->mResizeBar->hasMouseCapture()) 
-		{
-			if (pixels_to_distribute < 0.f)
-			{
-				// shrink proportionally to amount over minimum
-				// so we can do this in one pass
-				delta_size = (shrink_headroom_available > 0.f) 
-					? pixels_to_distribute * ((F32)(panelp->mFractionalSize - min_size) / shrink_headroom_available) 
-					: 0.f;
-				shrink_headroom_available -= (panelp->mFractionalSize - min_size);
+				mAnimatedThisFrame = true;
+				continue_animating = true;
 			}
 			else
 			{
-				// grow all elements equally
-				delta_size = pixels_to_distribute / (F32)num_resizable_panels;
-				num_resizable_panels--;
+				panelp->mCollapseAmt = collapse_state;
+				mAnimatedThisFrame = true;
 			}
-			
-			panelp->mFractionalSize = llmax(min_size, panelp->mFractionalSize + delta_size);
-			pixels_to_distribute -= delta_size;
 		}
+	}
 
-		// adjust running headroom count based on new sizes
-		shrink_headroom_total += delta_size;
+	if (mAnimatedThisFrame) mNeedsLayout = true;
+	return continue_animating;
+}
 
-		LLRect panel_rect;
-		if (mOrientation == HORIZONTAL)
-		{
-			panel_rect.setLeftTopAndSize(llround(cur_x), 
-										llround(cur_y), 
-										llround(panelp->mFractionalSize), 
-										getRect().getHeight());
-		}
-		else
-		{
-			panel_rect.setLeftTopAndSize(llround(cur_x), 
-										llround(cur_y), 
-										getRect().getWidth(), 
-										llround(panelp->mFractionalSize));
-		}
-		panelp->setShape(panel_rect);
+void LLLayoutStack::updatePanelRect( LLLayoutPanel* resized_panel, const LLRect& new_rect )
+{
+	S32 new_dim = (mOrientation == HORIZONTAL)
+					? new_rect.getWidth()
+					: new_rect.getHeight();
+	S32 delta_dim = new_dim - resized_panel->getVisibleDim();
+	if (delta_dim == 0) return;
 
-		LLRect resize_bar_rect = panel_rect;
-		if (mOrientation == HORIZONTAL)
-		{
-			resize_bar_rect.mLeft = panel_rect.mRight - resize_bar_overlap;
-			resize_bar_rect.mRight = panel_rect.mRight + mPanelSpacing + resize_bar_overlap;
-		}
-		else
-		{
-			resize_bar_rect.mTop = panel_rect.mBottom + resize_bar_overlap;
-			resize_bar_rect.mBottom = panel_rect.mBottom - mPanelSpacing - resize_bar_overlap;
-		}
-		(*panel_it)->mResizeBar->setRect(resize_bar_rect);
+	F32 total_visible_fraction = 0.f;
+	F32 delta_auto_resize_headroom = 0.f;
+	F32 original_auto_resize_headroom = 0.f;
 
-		F32 size = ((*panel_it)->mFractionalSize * (*panel_it)->getCollapseFactor()) + (F32)mPanelSpacing;
-		if (mOrientation == HORIZONTAL)
-		{
-			cur_x += size;
-		}
-		else //VERTICAL
-		{
-			cur_y -= size;
-		}
-	}
+	LLLayoutPanel* other_resize_panel = NULL;
+	LLLayoutPanel* following_panel = NULL;
 
-	// update resize bars with new limits
-	LLLayoutPanel* last_resizeable_panel = NULL;
-	for (panel_it = mPanels.begin(); panel_it != mPanels.end(); ++panel_it)
+	BOOST_REVERSE_FOREACH(LLLayoutPanel* panelp, mPanels)
 	{
-		LLLayoutPanel* panelp = (*panel_it);
-		S32 relevant_min = panelp->getRelevantMinDim();
-
-		if (mOrientation == HORIZONTAL)
+		if (panelp->mAutoResize)
 		{
-			(*panel_it)->mResizeBar->setResizeLimits(
-				relevant_min, 
-				relevant_min + llround(shrink_headroom_total));
+			original_auto_resize_headroom += (F32)(panelp->mTargetDim - panelp->getRelevantMinDim());
+			if (panelp->getVisible() && !panelp->mCollapsed)
+			{
+				total_visible_fraction += panelp->mFractionalSize;
+			}
 		}
-		else //VERTICAL
+
+		if (panelp == resized_panel)
 		{
-			(*panel_it)->mResizeBar->setResizeLimits(
-				relevant_min, 
-				relevant_min + llround(shrink_headroom_total));
+			other_resize_panel = following_panel;
 		}
 
-		// toggle resize bars based on panel visibility, resizability, etc
-		BOOL resize_bar_enabled = panelp->getVisible() && (*panel_it)->mUserResize;
-		(*panel_it)->mResizeBar->setVisible(resize_bar_enabled);
-
-		if ((*panel_it)->mUserResize || (*panel_it)->mAutoResize)
+		if (panelp->getVisible() && !panelp->mCollapsed)
 		{
-			last_resizeable_panel = (*panel_it);
+			following_panel = panelp;
 		}
 	}
 
-	// hide last resize bar as there is nothing past it
-	// resize bars need to be in between two resizable panels
-	if (last_resizeable_panel)
-	{
-		last_resizeable_panel->mResizeBar->setVisible(FALSE);
-	}
 
-	// not enough room to fit existing contents
-	if (force_resize == FALSE
-		// layout did not complete by reaching target position
-		&& ((mOrientation == VERTICAL && llround(cur_y) != -mPanelSpacing)
-			|| (mOrientation == HORIZONTAL && llround(cur_x) != getRect().getWidth() + mPanelSpacing)))
+	if (resized_panel->mAutoResize)
 	{
-		// do another layout pass with all stacked elements contributing
-		// even those that don't usually resize
-		llassert_always(force_resize == FALSE);
-		updateLayout(TRUE);
+		if (!other_resize_panel || !other_resize_panel->mAutoResize)
+		{
+			delta_auto_resize_headroom += delta_dim;	
+		}
 	}
-
-	 mAnimatedThisFrame = true;
-} // end LLLayoutStack::updateLayout
-
-
-LLLayoutPanel* LLLayoutStack::findEmbeddedPanel(LLPanel* panelp) const
-{
-	if (!panelp) return NULL;
-
-	e_panel_list_t::const_iterator panel_it;
-	for (panel_it = mPanels.begin(); panel_it != mPanels.end(); ++panel_it)
+	else 
 	{
-		if ((*panel_it) == panelp)
+		if (!other_resize_panel || other_resize_panel->mAutoResize)
 		{
-			return *panel_it;
+			delta_auto_resize_headroom -= delta_dim;
 		}
 	}
-	return NULL;
-}
 
-LLLayoutPanel* LLLayoutStack::findEmbeddedPanelByName(const std::string& name) const
-{
-	LLLayoutPanel* result = NULL;
+	F32 fraction_given_up = 0.f;
+	F32 fraction_remaining = 1.f;
+	F32 updated_auto_resize_headroom = original_auto_resize_headroom + delta_auto_resize_headroom;
 
-	for (e_panel_list_t::const_iterator panel_it = mPanels.begin(); panel_it != mPanels.end(); ++panel_it)
+	enum
 	{
-		LLLayoutPanel* p = *panel_it;
+		BEFORE_RESIZED_PANEL,
+		RESIZED_PANEL,
+		NEXT_PANEL,
+		AFTER_RESIZED_PANEL
+	} which_panel = BEFORE_RESIZED_PANEL;
 
-		if (p->getName() == name)
+	BOOST_FOREACH(LLLayoutPanel* panelp, mPanels)
+	{
+		if (!panelp->getVisible() || panelp->mCollapsed) continue;
+
+		if (panelp == resized_panel)
 		{
-			result = p;
-			break;
+			which_panel = RESIZED_PANEL;
 		}
-	}
 
-	return result;
-}
-
-// Compute sum of min_width or min_height of children
-void LLLayoutStack::calcMinExtents()
-{
-	mMinWidth = 0;
-	mMinHeight = 0;
-
-	e_panel_list_t::iterator panel_it;
-	for (panel_it = mPanels.begin(); panel_it != mPanels.end(); ++panel_it)
-	{
-		if (mOrientation == HORIZONTAL)
+		switch(which_panel)
 		{
-            mMinWidth += (*panel_it)->getRelevantMinDim();
-			if (panel_it != mPanels.begin())
+		case BEFORE_RESIZED_PANEL:
+			if (panelp->mAutoResize)
+			{	// freeze current size as fraction of overall auto_resize space
+				F32 fractional_adjustment_factor = updated_auto_resize_headroom == 0.f
+													? 1.f
+													: original_auto_resize_headroom / updated_auto_resize_headroom;
+				F32 new_fractional_size = llclamp(panelp->mFractionalSize * fractional_adjustment_factor,
+													MIN_FRACTIONAL_SIZE,
+													MAX_FRACTIONAL_SIZE);
+				fraction_given_up -= new_fractional_size - panelp->mFractionalSize;
+				fraction_remaining -= panelp->mFractionalSize;
+				panelp->mFractionalSize = new_fractional_size;
+				llassert(!llisnan(panelp->mFractionalSize));
+			}
+			else
 			{
-				mMinWidth += mPanelSpacing;
+				// leave non auto-resize panels alone
 			}
-		}
-		else //VERTICAL
-		{
-			mMinHeight += (*panel_it)->getRelevantMinDim();
-			if (panel_it != mPanels.begin())
+			break;
+		case RESIZED_PANEL:
+			if (panelp->mAutoResize)
+			{	// freeze new size as fraction
+				F32 new_fractional_size = (updated_auto_resize_headroom == 0.f)
+					? MAX_FRACTIONAL_SIZE
+					: llclamp(total_visible_fraction * (F32)(new_dim - panelp->getRelevantMinDim()) / updated_auto_resize_headroom, MIN_FRACTIONAL_SIZE, MAX_FRACTIONAL_SIZE);
+				fraction_given_up -= new_fractional_size - panelp->mFractionalSize;
+				fraction_remaining -= panelp->mFractionalSize;
+				panelp->mFractionalSize = new_fractional_size;
+				llassert(!llisnan(panelp->mFractionalSize));
+			}
+			else
+			{	// freeze new size as original size
+				panelp->mTargetDim = new_dim;
+			}
+			which_panel = NEXT_PANEL;
+			break;
+		case NEXT_PANEL:
+			if (panelp->mAutoResize)
+			{
+				fraction_remaining -= panelp->mFractionalSize;
+				if (resized_panel->mAutoResize)
+				{
+					panelp->mFractionalSize = llclamp(panelp->mFractionalSize + fraction_given_up, MIN_FRACTIONAL_SIZE, MAX_FRACTIONAL_SIZE);
+					fraction_given_up = 0.f;
+				}
+				else
+				{
+					F32 new_fractional_size = llclamp(total_visible_fraction * (F32)(panelp->mTargetDim - panelp->getRelevantMinDim() + delta_auto_resize_headroom) 
+														/ updated_auto_resize_headroom,
+													MIN_FRACTIONAL_SIZE,
+													MAX_FRACTIONAL_SIZE);
+					fraction_given_up -= new_fractional_size - panelp->mFractionalSize;
+					panelp->mFractionalSize = new_fractional_size;
+				}
+			}
+			else
 			{
-				mMinHeight += mPanelSpacing;
+				panelp->mTargetDim -= delta_dim;
 			}
+			which_panel = AFTER_RESIZED_PANEL;
+			break;
+		case AFTER_RESIZED_PANEL:
+			if (panelp->mAutoResize && fraction_given_up != 0.f)
+			{
+				panelp->mFractionalSize = llclamp(panelp->mFractionalSize + (panelp->mFractionalSize / fraction_remaining) * fraction_given_up,
+												MIN_FRACTIONAL_SIZE,
+												MAX_FRACTIONAL_SIZE);
+			}
+		default:
+			break;
 		}
 	}
+	updateLayout();
+	normalizeFractionalSizes();
 }
 
-void LLLayoutStack::createResizeBars()
+void LLLayoutStack::reshape(S32 width, S32 height, BOOL called_from_parent)
 {
-	for (e_panel_list_t::iterator panel_it = mPanels.begin(); panel_it != mPanels.end(); ++panel_it)
+	mNeedsLayout = true;
+	LLView::reshape(width, height, called_from_parent);
+}
+
+void LLLayoutStack::updateResizeBarLimits()
+{
+	LLLayoutPanel* previous_visible_panelp = NULL;
+	BOOST_REVERSE_FOREACH(LLLayoutPanel* visible_panelp, mPanels)
 	{
-		LLLayoutPanel* lp = (*panel_it);
-		if (lp->mResizeBar == NULL)
+		if (!visible_panelp->getVisible() || visible_panelp->mCollapsed)
 		{
-			LLResizeBar::Side side = (mOrientation == HORIZONTAL) ? LLResizeBar::RIGHT : LLResizeBar::BOTTOM;
-			LLRect resize_bar_rect = getRect();
-
-			LLResizeBar::Params resize_params;
-			resize_params.name("resize");
-			resize_params.resizing_view(lp);
-			resize_params.min_size(lp->getRelevantMinDim());
-			resize_params.side(side);
-			resize_params.snapping_enabled(false);
-			LLResizeBar* resize_bar = LLUICtrlFactory::create<LLResizeBar>(resize_params);
-			lp->mResizeBar = resize_bar;
-			LLView::addChild(resize_bar, 0);
+			visible_panelp->mResizeBar->setVisible(FALSE);
+			continue;
+		}
 
-			// bring all resize bars to the front so that they are clickable even over the panels
-			// with a bit of overlap
-			for (e_panel_list_t::iterator panel_it = mPanels.begin(); panel_it != mPanels.end(); ++panel_it)
-			{
-				LLResizeBar* resize_barp = (*panel_it)->mResizeBar;
-				sendChildToFront(resize_barp);
-			}
+		// toggle resize bars based on panel visibility, resizability, etc
+		if (previous_visible_panelp
+			&& (visible_panelp->mUserResize || previous_visible_panelp->mUserResize)				// one of the pair is user resizable
+			&& (visible_panelp->mAutoResize || visible_panelp->mUserResize)							// current panel is resizable
+			&& (previous_visible_panelp->mAutoResize || previous_visible_panelp->mUserResize))		// previous panel is resizable
+		{
+			visible_panelp->mResizeBar->setVisible(TRUE);
+			S32 previous_panel_headroom = previous_visible_panelp->getVisibleDim() - previous_visible_panelp->getRelevantMinDim();
+			visible_panelp->mResizeBar->setResizeLimits(visible_panelp->getRelevantMinDim(), 
+														visible_panelp->getVisibleDim() + previous_panel_headroom);
+		}
+		else
+		{
+			visible_panelp->mResizeBar->setVisible(FALSE);
 		}
-	}
-}
 
-// update layout stack animations, etc. once per frame
-// NOTE: we use this to size world view based on animating UI, *before* we draw the UI
-// we might still need to call updateLayout during UI draw phase, in case UI elements
-// are resizing themselves dynamically
-//static 
-void LLLayoutStack::updateClass()
-{
-	for (instance_iter it = beginInstances(); it != endInstances(); ++it)
-	{
-		it->updateLayout();
+		previous_visible_panelp = visible_panelp;
 	}
 }
diff --git a/indra/llui/lllayoutstack.h b/indra/llui/lllayoutstack.h
index ede6149a80..648cd5fdce 100644
--- a/indra/llui/lllayoutstack.h
+++ b/indra/llui/lllayoutstack.h
@@ -5,7 +5,7 @@
  *
  * $LicenseInfo:firstyear=2001&license=viewerlgpl$
  * Second Life Viewer Source Code
- * Copyright (C) 2010, Linden Research, Inc.
+ * Copyright (C) 2010, Linden Reshasearch, Inc.
  * 
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
@@ -60,6 +60,7 @@ public:
 								clip;
 		Optional<F32>			open_time_constant,
 								close_time_constant;
+		Optional<S32>			resize_bar_overlap;
 
 		Params();
 	};
@@ -71,13 +72,12 @@ public:
 	/*virtual*/ void draw();
 	/*virtual*/ void removeChild(LLView*);
 	/*virtual*/ BOOL postBuild();
-	/*virtual*/ bool addChild(LLView* child, S32 tab_group = 0);
+	/*virtual*/ bool addChild(LLView* child, S32 tab_groupdatefractuiona = 0);
+	/*virtual*/ void reshape(S32 width, S32 height, BOOL called_from_parent = TRUE);
+
 
 	static LLView* fromXML(LLXMLNodePtr node, LLView *parent, LLXMLNodePtr output_node = NULL);
 
-	S32 getMinWidth() const { return mMinWidth; }
-	S32 getMinHeight() const { return mMinHeight; }
-	
 	typedef enum e_animate
 	{
 		NO_ANIMATE,
@@ -85,47 +85,24 @@ public:
 	} EAnimate;
 
 	void addPanel(LLLayoutPanel* panel, EAnimate animate = NO_ANIMATE);
-	void removePanel(LLPanel* panel);
 	void collapsePanel(LLPanel* panel, BOOL collapsed = TRUE);
 	S32 getNumPanels() { return mPanels.size(); }
-	/**
-	 * Moves panel_to_move before target_panel inside layout stack (both panels should already be there).
-	 * If move_to_front is true target_panel is ignored and panel_to_move is moved to the beginning of mPanels
-	 */
-	void movePanel(LLPanel* panel_to_move, LLPanel* target_panel, bool move_to_front = false);
-
-	void updatePanelAutoResize(const std::string& panel_name, BOOL auto_resize);
-	void setPanelUserResize(const std::string& panel_name, BOOL user_resize);
-	
-	/**
-	 * Gets minimal dimension along layout_stack axis of the specified by name panel.
-	 *
-	 * @returns true if specified by panel_name internal panel exists, false otherwise.
-	 */
-	bool getPanelMinSize(const std::string& panel_name, S32* min_dimp);
-
-	/**
-	 * Gets maximal dimension along layout_stack axis of the specified by name panel.
-	 *
-	 * @returns true if specified by panel_name internal panel exists, false otherwise.
-	 */
-	bool getPanelMaxSize(const std::string& panel_name, S32* max_dim);
-	
-	void updateLayout(BOOL force_resize = FALSE);
-	
+
+	void updateLayout();
+
 	S32 getPanelSpacing() const { return mPanelSpacing; }
-	BOOL getAnimate () const { return mAnimate; }
-	void setAnimate (BOOL animate) { mAnimate = animate; }
 	
 	static void updateClass();
 
 protected:
 	LLLayoutStack(const Params&);
 	friend class LLUICtrlFactory;
+	friend class LLLayoutPanel;
 
 private:
-	void createResizeBars();
-	void calcMinExtents();
+	void updateResizeBarLimits();
+	bool animatePanels();
+	void createResizeBar(LLLayoutPanel* panel);
 
 	const ELayoutOrientation mOrientation;
 
@@ -134,17 +111,20 @@ private:
 
 	LLLayoutPanel* findEmbeddedPanel(LLPanel* panelp) const;
 	LLLayoutPanel* findEmbeddedPanelByName(const std::string& name) const;
+	void updateFractionalSizes();
+	void normalizeFractionalSizes();
+	void updatePanelRect( LLLayoutPanel* param1, const LLRect& new_rect );
 
-	S32 mMinWidth;  // calculated by calcMinExtents
-	S32 mMinHeight;  // calculated by calcMinExtents
 	S32 mPanelSpacing;
 
 	// true if we already applied animation this frame
 	bool mAnimatedThisFrame;
 	bool mAnimate;
 	bool mClip;
-	F32 mOpenTimeConstant;
-	F32 mCloseTimeConstant;
+	F32  mOpenTimeConstant;
+	F32  mCloseTimeConstant;
+	bool mNeedsLayout;
+	S32  mResizeBarOverlap;
 }; // end class LLLayoutStack
 
 
@@ -156,8 +136,7 @@ public:
 	struct Params : public LLInitParam::Block<Params, LLPanel::Params>
 	{
 		Optional<S32>			expanded_min_dim,
-								min_dim,
-								max_dim;
+								min_dim;
 		Optional<bool>			user_resize,
 								auto_resize;
 
@@ -168,16 +147,21 @@ public:
 
 	void initFromParams(const Params& p);
 
+	void handleReshape(const LLRect& new_rect, bool by_user);
+
 	void reshape(S32 width, S32 height, BOOL called_from_parent = TRUE);
+	
 
-	S32 getMinDim() const { return mMinDim; }
-	void setMinDim(S32 value) { mMinDim = value; if (!mExpandedMinDimSpecified) mExpandedMinDim = value; }
+	void setVisible(BOOL visible);
 
-	S32 getMaxDim() const { return mMaxDim; }
-	void setMaxDim(S32 value) { mMaxDim = value; }
+	S32 getLayoutDim() const;
+	S32 getTargetDim() const;
+	void setTargetDim(S32 value);
+	S32 getMinDim() const { return llmax(0, mMinDim); }
+	void setMinDim(S32 value) { mMinDim = value; }
 
-	S32 getExpandedMinDim() const { return mExpandedMinDim; }
-	void setExpandedMinDim(S32 value) { mExpandedMinDim = value; mExpandedMinDimSpecified = true; }
+	S32 getExpandedMinDim() const { return mExpandedMinDim >= 0 ? mExpandedMinDim : getMinDim(); }
+	void setExpandedMinDim(S32 value) { mExpandedMinDim = value; }
 	
 	S32 getRelevantMinDim() const
 	{
@@ -185,30 +169,35 @@ public:
 		
 		if (!mCollapsed)
 		{
-			min_dim = mExpandedMinDim;
+			min_dim = getExpandedMinDim();
 		}
 		
 		return min_dim;
 	}
 
-	void setOrientation(LLLayoutStack::ELayoutOrientation orientation) { mOrientation = orientation; }
+	F32 getAutoResizeFactor() const;
+	F32 getVisibleAmount() const;
+	S32 getVisibleDim() const;
+
+	void setOrientation(LLLayoutStack::ELayoutOrientation orientation);
+	void storeOriginalDim();
+
+	void setIgnoreReshape(bool ignore) { mIgnoreReshape = ignore; }
 
 protected:
 	LLLayoutPanel(const Params& p);
 	
-	F32 getCollapseFactor();
+	const bool	mAutoResize;
+	const bool	mUserResize;
 
-	bool	mExpandedMinDimSpecified;
 	S32		mExpandedMinDim;
-	
 	S32		mMinDim;
-	S32		mMaxDim;
-	bool	mAutoResize;
-	bool	mUserResize;
 	bool	mCollapsed;
 	F32		mVisibleAmt;
 	F32		mCollapseAmt;
 	F32		mFractionalSize;
+	S32		mTargetDim;
+	bool	mIgnoreReshape;
 	LLLayoutStack::ELayoutOrientation mOrientation;
 	class LLResizeBar* mResizeBar;
 };
diff --git a/indra/llui/lllineeditor.cpp b/indra/llui/lllineeditor.cpp
index 06dfc90d83..d0fbf4b913 100644
--- a/indra/llui/lllineeditor.cpp
+++ b/indra/llui/lllineeditor.cpp
@@ -1047,7 +1047,7 @@ void LLLineEditor::cut()
 		// Prepare for possible rollback
 		LLLineEditorRollback rollback( this );
 
-		gClipboard.copyFromSubstring( mText.getWString(), left_pos, length );
+		LLClipboard::instance().copyToClipboard( mText.getWString(), left_pos, length );
 		deleteSelection();
 
 		// Validate new string and rollback the if needed.
@@ -1078,13 +1078,13 @@ void LLLineEditor::copy()
 	{
 		S32 left_pos = llmin( mSelectionStart, mSelectionEnd );
 		S32 length = llabs( mSelectionStart - mSelectionEnd );
-		gClipboard.copyFromSubstring( mText.getWString(), left_pos, length );
+		LLClipboard::instance().copyToClipboard( mText.getWString(), left_pos, length );
 	}
 }
 
 BOOL LLLineEditor::canPaste() const
 {
-	return !mReadOnly && gClipboard.canPasteString(); 
+	return !mReadOnly && LLClipboard::instance().isTextAvailable(); 
 }
 
 void LLLineEditor::paste()
@@ -1115,14 +1115,7 @@ void LLLineEditor::pasteHelper(bool is_primary)
 	if (can_paste_it)
 	{
 		LLWString paste;
-		if (is_primary)
-		{
-			paste = gClipboard.getPastePrimaryWString();
-		}
-		else 
-		{
-			paste = gClipboard.getPasteWString();
-		}
+		LLClipboard::instance().pasteFromClipboard(paste, is_primary);
 
 		if (!paste.empty())
 		{
@@ -1209,13 +1202,13 @@ void LLLineEditor::copyPrimary()
 	{
 		S32 left_pos = llmin( mSelectionStart, mSelectionEnd );
 		S32 length = llabs( mSelectionStart - mSelectionEnd );
-		gClipboard.copyFromPrimarySubstring( mText.getWString(), left_pos, length );
+		LLClipboard::instance().copyToClipboard( mText.getWString(), left_pos, length, true);
 	}
 }
 
 BOOL LLLineEditor::canPastePrimary() const
 {
-	return !mReadOnly && gClipboard.canPastePrimaryString(); 
+	return !mReadOnly && LLClipboard::instance().isTextAvailable(true); 
 }
 
 void LLLineEditor::updatePrimary()
@@ -1630,7 +1623,7 @@ void LLLineEditor::draw()
 	LLRect background( 0, getRect().getHeight(), getRect().getWidth(), 0 );
 	background.stretch( -mBorderThickness );
 
-	S32 lineeditor_v_pad = llround((background.getHeight() - mGLFont->getLineHeight())/2);
+	S32 lineeditor_v_pad = (background.getHeight() - mGLFont->getLineHeight()) / 2;
 
 	drawBackground();
 	
diff --git a/indra/llui/llmenugl.cpp b/indra/llui/llmenugl.cpp
index cb237fca7c..ff6928ffda 100644
--- a/indra/llui/llmenugl.cpp
+++ b/indra/llui/llmenugl.cpp
@@ -317,7 +317,7 @@ void LLMenuItemGL::setJumpKey(KEY key)
 // virtual 
 U32 LLMenuItemGL::getNominalHeight( void ) const 
 { 
-	return llround(mFont->getLineHeight()) + MENU_ITEM_PADDING; 
+	return mFont->getLineHeight() + MENU_ITEM_PADDING;
 }
 
 //virtual
@@ -508,19 +508,19 @@ void LLMenuItemGL::draw( void )
 	{
 		if( !mDrawBoolLabel.empty() )
 		{
-			mFont->render( mDrawBoolLabel.getWString(), 0, (F32)LEFT_PAD_PIXELS, ((F32)MENU_ITEM_PADDING / 2.f) + 1.f, color,
+			mFont->render( mDrawBoolLabel.getWString(), 0, (F32)LEFT_PAD_PIXELS, ((F32)MENU_ITEM_PADDING / 2.f), color,
 						   LLFontGL::LEFT, LLFontGL::BOTTOM, LLFontGL::NORMAL, LLFontGL::NO_SHADOW, S32_MAX, S32_MAX, NULL, FALSE );
 		}
-		mFont->render( mLabel.getWString(), 0, (F32)LEFT_PLAIN_PIXELS, ((F32)MENU_ITEM_PADDING / 2.f) + 1.f, color,
+		mFont->render( mLabel.getWString(), 0, (F32)LEFT_PLAIN_PIXELS, ((F32)MENU_ITEM_PADDING / 2.f), color,
 					   LLFontGL::LEFT, LLFontGL::BOTTOM, LLFontGL::NORMAL, LLFontGL::NO_SHADOW, S32_MAX, S32_MAX, NULL, FALSE );
 		if( !mDrawAccelLabel.empty() )
 		{
-			mFont->render( mDrawAccelLabel.getWString(), 0, (F32)getRect().mRight - (F32)RIGHT_PLAIN_PIXELS, ((F32)MENU_ITEM_PADDING / 2.f) + 1.f, color,
+			mFont->render( mDrawAccelLabel.getWString(), 0, (F32)getRect().mRight - (F32)RIGHT_PLAIN_PIXELS, ((F32)MENU_ITEM_PADDING / 2.f), color,
 						   LLFontGL::RIGHT, LLFontGL::BOTTOM, LLFontGL::NORMAL, LLFontGL::NO_SHADOW, S32_MAX, S32_MAX, NULL, FALSE );
 		}
 		if( !mDrawBranchLabel.empty() )
 		{
-			mFont->render( mDrawBranchLabel.getWString(), 0, (F32)getRect().mRight - (F32)RIGHT_PAD_PIXELS, ((F32)MENU_ITEM_PADDING / 2.f) + 1.f, color,
+			mFont->render( mDrawBranchLabel.getWString(), 0, (F32)getRect().mRight - (F32)RIGHT_PAD_PIXELS, ((F32)MENU_ITEM_PADDING / 2.f), color,
 						   LLFontGL::RIGHT, LLFontGL::BOTTOM, LLFontGL::NORMAL, LLFontGL::NO_SHADOW, S32_MAX, S32_MAX, NULL, FALSE );
 		}
 	}
@@ -947,9 +947,14 @@ LLMenuItemBranchGL::LLMenuItemBranchGL(const LLMenuItemBranchGL::Params& p)
 
 LLMenuItemBranchGL::~LLMenuItemBranchGL()
 {
-	delete mBranchHandle.get();
+	if (mBranchHandle.get())
+	{
+		mBranchHandle.get()->die();
+	}
 }
 
+
+
 // virtual
 LLView* LLMenuItemBranchGL::getChildView(const std::string& name, BOOL recurse) const
 {
@@ -1961,7 +1966,7 @@ void LLMenuGL::arrange( void )
 
 		// *FIX: create the item first and then ask for its dimensions?
 		S32 spillover_item_width = PLAIN_PAD_PIXELS + LLFontGL::getFontSansSerif()->getWidth( std::string("More") ); // *TODO: Translate
-		S32 spillover_item_height = llround(LLFontGL::getFontSansSerif()->getLineHeight()) + MENU_ITEM_PADDING;
+		S32 spillover_item_height = LLFontGL::getFontSansSerif()->getLineHeight() + MENU_ITEM_PADDING;
 
 		// Scrolling support
 		item_list_t::iterator first_visible_item_iter;
@@ -3077,7 +3082,7 @@ void LLMenuGL::showPopup(LLView* spawning_view, LLMenuGL* menu, S32 x, S32 y)
 		mouse_y + MOUSE_CURSOR_PADDING, 
 		CURSOR_WIDTH + MOUSE_CURSOR_PADDING * 2, 
 		CURSOR_HEIGHT + MOUSE_CURSOR_PADDING * 2);
-	menu->translateIntoRectWithExclusion( menu_region_rect, mouse_rect, FALSE );
+	menu->translateIntoRectWithExclusion( menu_region_rect, mouse_rect );
 	menu->getParent()->sendChildToFront(menu);
 }
 
@@ -3420,7 +3425,7 @@ void LLMenuHolderGL::draw()
 		
 		LLUI::pushMatrix();
 		{
-			LLUI::translate((F32)item_rect.mLeft, (F32)item_rect.mBottom, 0.f);
+			LLUI::translate((F32)item_rect.mLeft, (F32)item_rect.mBottom);
 			selecteditem->getMenu()->drawBackground(selecteditem, interpolant);
 			selecteditem->draw();
 		}
diff --git a/indra/llui/llmenugl.h b/indra/llui/llmenugl.h
index bdae899933..36f3ba34b9 100644
--- a/indra/llui/llmenugl.h
+++ b/indra/llui/llmenugl.h
@@ -681,7 +681,7 @@ public:
 
 			BOOL	appendContextSubMenu(LLContextMenu *menu);
 
-			LLHandle<LLContextMenu> getHandle() { mHandle.bind(this); return mHandle; }
+			LLHandle<LLContextMenu> getHandle() { return getDerivedHandle<LLContextMenu>(); }
 
 protected:
 	BOOL						mHoveredAnyItem;
diff --git a/indra/llui/llnotifications.cpp b/indra/llui/llnotifications.cpp
index 8f7025a9a6..8aa548b974 100644
--- a/indra/llui/llnotifications.cpp
+++ b/indra/llui/llnotifications.cpp
@@ -1412,6 +1412,7 @@ void addPathIfExists(const std::string& new_path, std::vector<std::string>& path
 
 bool LLNotifications::loadTemplates()
 {
+	llinfos << "Reading notifications template" << llendl;
 	std::vector<std::string> search_paths;
 	
 	std::string skin_relative_path = gDirUtilp->getDirDelimiter() + LLUI::getSkinPath() + gDirUtilp->getDirDelimiter() + "notifications.xml";
@@ -1484,6 +1485,8 @@ bool LLNotifications::loadTemplates()
 		mTemplates[notification.name] = LLNotificationTemplatePtr(new LLNotificationTemplate(notification));
 	}
 
+	llinfos << "...done" << llendl;
+
 	return true;
 }
 
@@ -1624,7 +1627,7 @@ LLNotificationPtr LLNotifications::find(LLUUID uuid)
 	LLNotificationSet::iterator it=mItems.find(target);
 	if (it == mItems.end())
 	{
-		llwarns << "Tried to dereference uuid '" << uuid << "' as a notification key but didn't find it." << llendl;
+		LL_DEBUGS("Notifications") << "Tried to dereference uuid '" << uuid << "' as a notification key but didn't find it." << llendl;
 		return LLNotificationPtr((LLNotification*)NULL);
 	}
 	else
diff --git a/indra/llui/llnotifications.h b/indra/llui/llnotifications.h
index 462d69be2e..3df2efcac3 100644
--- a/indra/llui/llnotifications.h
+++ b/indra/llui/llnotifications.h
@@ -690,7 +690,7 @@ typedef std::multimap<std::string, LLNotificationPtr> LLNotificationMap;
 // Abstract base class (interface) for a channel; also used for the master container.
 // This lets us arrange channels into a call hierarchy.
 
-// We maintain a heirarchy of notification channels; events are always started at the top
+// We maintain a hierarchy of notification channels; events are always started at the top
 // and propagated through the hierarchy only if they pass a filter.
 // Any channel can be created with a parent. A null parent (empty string) means it's
 // tied to the root of the tree (the LLNotifications class itself).
diff --git a/indra/llui/llpanel.cpp b/indra/llui/llpanel.cpp
index a45b617c2e..00318cec6b 100644
--- a/indra/llui/llpanel.cpp
+++ b/indra/llui/llpanel.cpp
@@ -122,8 +122,6 @@ LLPanel::LLPanel(const LLPanel::Params& p)
 	{
 		addBorder(p.border);
 	}
-	
-	mPanelHandle.bind(this);
 }
 
 LLPanel::~LLPanel()
diff --git a/indra/llui/llpanel.h b/indra/llui/llpanel.h
index ab1c87caff..f620201020 100644
--- a/indra/llui/llpanel.h
+++ b/indra/llui/llpanel.h
@@ -135,6 +135,8 @@ public:
 	const LLColor4&	getBackgroundColor() const { return mBgOpaqueColor; }
 	void			setTransparentColor(const LLColor4& color) { mBgAlphaColor = color; }
 	const LLColor4& getTransparentColor() const { return mBgAlphaColor; }
+	void			setBackgroundImage(LLUIImage* image) { mBgOpaqueImage = image; }
+	void			setTransparentImage(LLUIImage* image) { mBgAlphaImage = image; }
 	LLPointer<LLUIImage> getBackgroundImage() const { return mBgOpaqueImage; }
 	LLPointer<LLUIImage> getTransparentImage() const { return mBgAlphaImage; }
 	LLColor4		getBackgroundImageOverlay() { return mBgOpaqueImageOverlay; }
@@ -153,7 +155,7 @@ public:
 	
 	void			setCtrlsEnabled(BOOL b);
 
-	LLHandle<LLPanel>	getHandle() const { return mPanelHandle; }
+	LLHandle<LLPanel>	getHandle() const { return getDerivedHandle<LLPanel>(); }
 
 	const LLCallbackMap::map_t& getFactoryMap() const { return mFactoryMap; }
 	
@@ -278,7 +280,6 @@ private:
 	LLViewBorder*	mBorder;
 	LLButton*		mDefaultBtn;
 	LLUIString		mLabel;
-	LLRootHandle<LLPanel> mPanelHandle;
 
 	typedef std::map<std::string, std::string> ui_string_map_t;
 	ui_string_map_t	mUIStrings;
diff --git a/indra/llui/llresizebar.cpp b/indra/llui/llresizebar.cpp
index 02f60c76fa..87aeb4d7a7 100644
--- a/indra/llui/llresizebar.cpp
+++ b/indra/llui/llresizebar.cpp
@@ -79,6 +79,8 @@ LLResizeBar::LLResizeBar(const LLResizeBar::Params& p)
 
 BOOL LLResizeBar::handleMouseDown(S32 x, S32 y, MASK mask)
 {
+	if (!canResize()) return FALSE;
+
 	// Route future Mouse messages here preemptively.  (Release on mouse up.)
 	// No handler needed for focus lost since this clas has no state that depends on it.
 	gFocusMgr.setMouseCapture( this );
@@ -243,7 +245,7 @@ BOOL LLResizeBar::handleHover(S32 x, S32 y, MASK mask)
 		handled = TRUE;
 	}
 
-	if( handled )
+	if( handled && canResize() )
 	{
 		switch( mSide )
 		{
diff --git a/indra/llui/llresizebar.h b/indra/llui/llresizebar.h
index 0725fbd846..6daf191918 100644
--- a/indra/llui/llresizebar.h
+++ b/indra/llui/llresizebar.h
@@ -70,6 +70,7 @@ public:
 	void			setResizeLimits( S32 min_size, S32 max_size ) { mMinSize = min_size; mMaxSize = max_size; }
 	void			setEnableSnapping(BOOL enable) { mSnappingEnabled = enable; }
 	void			setAllowDoubleClickSnapping(BOOL allow) { mAllowDoubleClickSnapping = allow; }
+	bool			canResize() { return getEnabled() && mMaxSize > mMinSize; }
 
 private:
 	S32				mDragLastScreenX;
diff --git a/indra/llui/llscrollcontainer.cpp b/indra/llui/llscrollcontainer.cpp
index fe3f688fc5..9b7e30bb04 100644
--- a/indra/llui/llscrollcontainer.cpp
+++ b/indra/llui/llscrollcontainer.cpp
@@ -378,19 +378,24 @@ void LLScrollContainer::calcVisibleSize( S32 *visible_width, S32 *visible_height
 
 	if (!mHideScrollbar)
 	{
-		if( *visible_height < doc_height )
+		// Note: 1 pixel change can happen on final animation and should not trigger 
+		// the display of sliders.
+		if ((doc_height - *visible_height) > 1)
 		{
 			*show_v_scrollbar = TRUE;
 			*visible_width -= scrollbar_size;
 		}
-
-		if( *visible_width < doc_width )
+		if ((doc_width - *visible_width) > 1)
 		{
 			*show_h_scrollbar = TRUE;
 			*visible_height -= scrollbar_size;
 
+			// The view inside the scroll container should not be extended
+			// to container's full height to ensure the correct computation
+			// of *show_v_scrollbar after subtracting horizontal scrollbar_size.
+
 			// Must retest now that visible_height has changed
-			if( !*show_v_scrollbar && (*visible_height < doc_height) )
+			if( !*show_v_scrollbar && ((doc_height - *visible_height) > 1) )
 			{
 				*show_v_scrollbar = TRUE;
 				*visible_width -= scrollbar_size;
@@ -424,63 +429,66 @@ void LLScrollContainer::draw()
 		focusFirstItem();
 	}
 
-	// Draw background
-	if( mIsOpaque )
+	if (getRect().isValid()) 
 	{
-		F32 alpha = getCurrentTransparency();
+		// Draw background
+		if( mIsOpaque )
+		{
+			F32 alpha = getCurrentTransparency();
 
-		gGL.getTexUnit(0)->unbind(LLTexUnit::TT_TEXTURE);
-		gl_rect_2d(mInnerRect, mBackgroundColor.get() % alpha);
-	}
+			gGL.getTexUnit(0)->unbind(LLTexUnit::TT_TEXTURE);
+			gl_rect_2d(mInnerRect, mBackgroundColor.get() % alpha);
+		}
 	
-	// Draw mScrolledViews and update scroll bars.
-	// get a scissor region ready, and draw the scrolling view. The
-	// scissor region ensures that we don't draw outside of the bounds
-	// of the rectangle.
-	if( mScrolledView )
-	{
-		updateScroll();
-
-		// Draw the scrolled area.
+		// Draw mScrolledViews and update scroll bars.
+		// get a scissor region ready, and draw the scrolling view. The
+		// scissor region ensures that we don't draw outside of the bounds
+		// of the rectangle.
+		if( mScrolledView )
 		{
-			S32 visible_width = 0;
-			S32 visible_height = 0;
-			BOOL show_v_scrollbar = FALSE;
-			BOOL show_h_scrollbar = FALSE;
-			calcVisibleSize( &visible_width, &visible_height, &show_h_scrollbar, &show_v_scrollbar );
-
-			LLLocalClipRect clip(LLRect(mInnerRect.mLeft, 
-					mInnerRect.mBottom + (show_h_scrollbar ? scrollbar_size : 0) + visible_height,
-					mInnerRect.mRight - (show_v_scrollbar ? scrollbar_size: 0),
-					mInnerRect.mBottom + (show_h_scrollbar ? scrollbar_size : 0)
-					));
-			drawChild(mScrolledView);
-		}
-	}
-
-	// Highlight border if a child of this container has keyboard focus
-	if( mBorder->getVisible() )
-	{
-		mBorder->setKeyboardFocusHighlight( gFocusMgr.childHasKeyboardFocus(this) );
-	}
+			updateScroll();
 
-	// Draw all children except mScrolledView
-	// Note: scrollbars have been adjusted by above drawing code
-	for (child_list_const_reverse_iter_t child_iter = getChildList()->rbegin();
-		 child_iter != getChildList()->rend(); ++child_iter)
-	{
-		LLView *viewp = *child_iter;
-		if( sDebugRects )
-		{
-			sDepth++;
+			// Draw the scrolled area.
+			{
+				S32 visible_width = 0;
+				S32 visible_height = 0;
+				BOOL show_v_scrollbar = FALSE;
+				BOOL show_h_scrollbar = FALSE;
+				calcVisibleSize( &visible_width, &visible_height, &show_h_scrollbar, &show_v_scrollbar );
+
+				LLLocalClipRect clip(LLRect(mInnerRect.mLeft, 
+						mInnerRect.mBottom + (show_h_scrollbar ? scrollbar_size : 0) + visible_height,
+						mInnerRect.mRight - (show_v_scrollbar ? scrollbar_size: 0),
+						mInnerRect.mBottom + (show_h_scrollbar ? scrollbar_size : 0)
+						));
+				drawChild(mScrolledView);
+			}
 		}
-		if( (viewp != mScrolledView) && viewp->getVisible() )
+
+		// Highlight border if a child of this container has keyboard focus
+		if( mBorder->getVisible() )
 		{
-			drawChild(viewp);
+			mBorder->setKeyboardFocusHighlight( gFocusMgr.childHasKeyboardFocus(this) );
 		}
-		if( sDebugRects )
+
+		// Draw all children except mScrolledView
+		// Note: scrollbars have been adjusted by above drawing code
+		for (child_list_const_reverse_iter_t child_iter = getChildList()->rbegin();
+			 child_iter != getChildList()->rend(); ++child_iter)
 		{
-			sDepth--;
+			LLView *viewp = *child_iter;
+			if( sDebugRects )
+			{
+				sDepth++;
+			}
+			if( (viewp != mScrolledView) && viewp->getVisible() )
+			{
+				drawChild(viewp);
+			}
+			if( sDebugRects )
+			{
+				sDepth--;
+			}
 		}
 	}
 } // end draw
diff --git a/indra/llui/llscrollcontainer.h b/indra/llui/llscrollcontainer.h
index 3aa79cc255..d87c95b3d7 100644
--- a/indra/llui/llscrollcontainer.h
+++ b/indra/llui/llscrollcontainer.h
@@ -91,7 +91,7 @@ public:
 	void			setReserveScrollCorner( BOOL b ) { mReserveScrollCorner = b; }
 	LLRect			getVisibleContentRect();
 	LLRect			getContentWindowRect();
-	const LLRect&	getScrolledViewRect() const { return mScrolledView ? mScrolledView->getRect() : LLRect::null; }
+	virtual const LLRect	getScrolledViewRect() const { return mScrolledView ? mScrolledView->getRect() : LLRect::null; }
 	void			pageUp(S32 overlap = 0);
 	void			pageDown(S32 overlap = 0);
 	void			goToTop();
@@ -116,6 +116,9 @@ public:
 	
 	bool autoScroll(S32 x, S32 y);
 
+protected:
+	LLView*		mScrolledView;
+
 private:
 	// internal scrollbar handlers
 	virtual void scrollHorizontal( S32 new_pos );
@@ -124,7 +127,6 @@ private:
 	void calcVisibleSize( S32 *visible_width, S32 *visible_height, BOOL* show_h_scrollbar, BOOL* show_v_scrollbar ) const;
 
 	LLScrollbar* mScrollbar[SCROLLBAR_COUNT];
-	LLView*		mScrolledView;
 	S32			mSize;
 	BOOL		mIsOpaque;
 	LLUIColor	mBackgroundColor;
diff --git a/indra/llui/llscrolllistcell.cpp b/indra/llui/llscrolllistcell.cpp
index 9d25c7180d..8000efad0e 100644
--- a/indra/llui/llscrolllistcell.cpp
+++ b/indra/llui/llscrolllistcell.cpp
@@ -232,7 +232,7 @@ BOOL LLScrollListText::getVisible() const
 //virtual 
 S32 LLScrollListText::getHeight() const
 {
-	return llround(mFont->getLineHeight());
+	return mFont->getLineHeight();
 }
 
 
@@ -306,7 +306,7 @@ void LLScrollListText::draw(const LLColor4& color, const LLColor4& highlight_col
 			break;
 		}
 		LLRect highlight_rect(left - 2, 
-				llround(mFont->getLineHeight()) + 1, 
+				mFont->getLineHeight() + 1, 
 				left + mFont->getWidth(mText.getString(), mHighlightOffset, mHighlightCount) + 1, 
 				1);
 		mRoundedRectImage->draw(highlight_rect, highlight_color);
@@ -329,7 +329,7 @@ void LLScrollListText::draw(const LLColor4& color, const LLColor4& highlight_col
 		break;
 	}
 	mFont->render(mText.getWString(), 0, 
-					start_x, 2.f,
+					start_x, 0.f,
 					display_color,
 					mFontAlignment,
 					LLFontGL::BOTTOM, 
diff --git a/indra/llui/llscrolllistctrl.cpp b/indra/llui/llscrolllistctrl.cpp
index 622f3e215c..b3e1b63db5 100644
--- a/indra/llui/llscrolllistctrl.cpp
+++ b/indra/llui/llscrolllistctrl.cpp
@@ -175,6 +175,7 @@ LLScrollListCtrl::LLScrollListCtrl(const LLScrollListCtrl::Params& p)
 	mBorder(NULL),
 	mSortCallback(NULL),
 	mPopupMenu(NULL),
+	mCommentTextView(NULL),
 	mNumDynamicWidthColumns(0),
 	mTotalStaticColumnWidth(0),
 	mTotalColumnPadding(0),
@@ -476,7 +477,12 @@ void LLScrollListCtrl::updateLayout()
 		getRect().getWidth() - 2 * mBorderThickness,
 		getRect().getHeight() - (2 * mBorderThickness ) - heading_size );
 
-	getChildView("comment_text")->setShape(mItemListRect);
+	if (mCommentTextView == NULL)
+	{
+		mCommentTextView = getChildView("comment_text");
+	}
+
+	mCommentTextView->setShape(mItemListRect);
 
 	// how many lines of content in a single "page"
 	S32 page_lines =  getLinesPerPage();
@@ -2498,7 +2504,7 @@ void	LLScrollListCtrl::copy()
 	{
 		buffer += (*itor)->getContentsCSV() + "\n";
 	}
-	gClipboard.copyFromSubstring(utf8str_to_wstring(buffer), 0, buffer.length());
+	LLClipboard::instance().copyToClipboard(utf8str_to_wstring(buffer), 0, buffer.length());
 }
 
 // virtual
diff --git a/indra/llui/llscrolllistctrl.h b/indra/llui/llscrolllistctrl.h
index 09ab89960d..ae8aea9245 100644
--- a/indra/llui/llscrolllistctrl.h
+++ b/indra/llui/llscrolllistctrl.h
@@ -480,6 +480,8 @@ private:
 	S32				mHighlightedItem;
 	class LLViewBorder*	mBorder;
 	LLContextMenu	*mPopupMenu;
+	
+	LLView			*mCommentTextView;
 
 	LLWString		mSearchString;
 	LLFrameTimer	mSearchTimer;
diff --git a/indra/llui/llscrolllistitem.cpp b/indra/llui/llscrolllistitem.cpp
index d95752e31c..5a1e96ab03 100644
--- a/indra/llui/llscrolllistitem.cpp
+++ b/indra/llui/llscrolllistitem.cpp
@@ -138,7 +138,7 @@ void LLScrollListItem::draw(const LLRect& rect, const LLColor4& fg_color, const
 
 		LLUI::pushMatrix();
 		{
-			LLUI::translate((F32) cur_x, (F32) rect.mBottom, 0.0f);
+			LLUI::translate((F32) cur_x, (F32) rect.mBottom);
 
 			cell->draw( fg_color, highlight_color );
 		}
diff --git a/indra/llui/llscrolllistitem.h b/indra/llui/llscrolllistitem.h
index 611df729b4..13655b5873 100644
--- a/indra/llui/llscrolllistitem.h
+++ b/indra/llui/llscrolllistitem.h
@@ -33,10 +33,10 @@
 #include "v4color.h"
 #include "llinitparam.h"
 #include "llscrolllistcell.h"
+#include "llcoord.h"
 
 #include <vector>
 
-class LLCoordGL;
 class LLCheckBoxCtrl;
 class LLResizeBar;
 class LLScrollListCtrl;
diff --git a/indra/llui/llspinctrl.h b/indra/llui/llspinctrl.h
index d197084e38..87814f838e 100644
--- a/indra/llui/llspinctrl.h
+++ b/indra/llui/llspinctrl.h
@@ -96,6 +96,9 @@ public:
 
 	void			onUpBtn(const LLSD& data);
 	void			onDownBtn(const LLSD& data);
+	
+	const LLColor4&	getEnabledTextColor() const	{ return mTextEnabledColor.get(); }
+	const LLColor4&	getDisabledTextColor() const { return mTextDisabledColor.get(); }
 
 private:
 	void			updateLabelColor();
diff --git a/indra/llui/lltabcontainer.cpp b/indra/llui/lltabcontainer.cpp
index ad1f3c504d..5fc2cc350d 100644
--- a/indra/llui/lltabcontainer.cpp
+++ b/indra/llui/lltabcontainer.cpp
@@ -98,24 +98,25 @@ class LLCustomButtonIconCtrl : public LLButton
 {
 public:
 	struct Params
-	: public LLInitParam::Block<Params, LLButton::Params>
+	:	public LLInitParam::Block<Params, LLButton::Params>
 	{
 		// LEFT, RIGHT, TOP, BOTTOM paddings of LLIconCtrl in this class has same value
 		Optional<S32>					icon_ctrl_pad;
 
-		Params():
-		icon_ctrl_pad("icon_ctrl_pad", 1)
+		Params()
+		:	icon_ctrl_pad("icon_ctrl_pad", 1)
 		{}
 	};
 
 protected:
 	friend class LLUICtrlFactory;
-	LLCustomButtonIconCtrl(const Params& p):
-		LLButton(p),
+
+	LLCustomButtonIconCtrl(const Params& p)
+	:	LLButton(p),
 		mIcon(NULL),
 		mIconAlignment(LLFontGL::HCENTER),
 		mIconCtrlPad(p.icon_ctrl_pad)
-		{}
+	{}
 
 public:
 
@@ -214,6 +215,7 @@ LLTabContainer::Params::Params()
 	middle_tab("middle_tab"),
 	last_tab("last_tab"),
 	use_custom_icon_ctrl("use_custom_icon_ctrl", false),
+	open_tabs_on_drag_and_drop("open_tabs_on_drag_and_drop", false),
 	tab_icon_ctrl_pad("tab_icon_ctrl_pad", 0),
 	use_ellipses("use_ellipses"),
 	font_halign("halign")
@@ -250,6 +252,7 @@ LLTabContainer::LLTabContainer(const LLTabContainer::Params& p)
 	mMiddleTabParams(p.middle_tab),
 	mLastTabParams(p.last_tab),
 	mCustomIconCtrlUsed(p.use_custom_icon_ctrl),
+	mOpenTabsOnDragAndDrop(p.open_tabs_on_drag_and_drop),
 	mTabIconCtrlPad(p.tab_icon_ctrl_pad),
 	mUseTabEllipses(p.use_ellipses)
 {
@@ -812,50 +815,62 @@ BOOL LLTabContainer::handleDragAndDrop(S32 x, S32 y, MASK mask,	BOOL drop,	EDrag
 {
 	BOOL has_scroll_arrows = (getMaxScrollPos() > 0);
 
-	if( !getTabsHidden()
-		&& mDragAndDropDelayTimer.getStarted() 
-		&& mDragAndDropDelayTimer.getElapsedTimeF32() > SCROLL_DELAY_TIME )
+	if(mOpenTabsOnDragAndDrop && !getTabsHidden())
 	{
-		if (has_scroll_arrows)
+		// In that case, we'll open the hovered tab while dragging and dropping items.
+		// This allows for drilling through tabs.
+		if (mDragAndDropDelayTimer.getStarted())
 		{
-			if (mJumpPrevArrowBtn && mJumpPrevArrowBtn->getRect().pointInRect(x, y))
-			{
-				S32	local_x	= x	- mJumpPrevArrowBtn->getRect().mLeft;
-				S32	local_y	= y	- mJumpPrevArrowBtn->getRect().mBottom;
-				mJumpPrevArrowBtn->handleHover(local_x,	local_y, mask);
-			}
-			if (mJumpNextArrowBtn && mJumpNextArrowBtn->getRect().pointInRect(x, y))
-			{
-				S32	local_x	= x	- mJumpNextArrowBtn->getRect().mLeft;
-				S32	local_y	= y	- mJumpNextArrowBtn->getRect().mBottom;
-				mJumpNextArrowBtn->handleHover(local_x,	local_y, mask);
-			}
-			if (mPrevArrowBtn->getRect().pointInRect(x,	y))
-			{
-				S32	local_x	= x	- mPrevArrowBtn->getRect().mLeft;
-				S32	local_y	= y	- mPrevArrowBtn->getRect().mBottom;
-				mPrevArrowBtn->handleHover(local_x,	local_y, mask);
-			}
-			else if	(mNextArrowBtn->getRect().pointInRect(x, y))
+			if (mDragAndDropDelayTimer.getElapsedTimeF32() > SCROLL_DELAY_TIME)
 			{
-				S32	local_x	= x	- mNextArrowBtn->getRect().mLeft;
-				S32	local_y	= y	- mNextArrowBtn->getRect().mBottom;
-				mNextArrowBtn->handleHover(local_x, local_y, mask);
-			}
-		}
+				if (has_scroll_arrows)
+				{
+					if (mJumpPrevArrowBtn && mJumpPrevArrowBtn->getRect().pointInRect(x, y))
+					{
+						S32	local_x	= x	- mJumpPrevArrowBtn->getRect().mLeft;
+						S32	local_y	= y	- mJumpPrevArrowBtn->getRect().mBottom;
+						mJumpPrevArrowBtn->handleHover(local_x,	local_y, mask);
+					}
+					if (mJumpNextArrowBtn && mJumpNextArrowBtn->getRect().pointInRect(x, y))
+					{
+						S32	local_x	= x	- mJumpNextArrowBtn->getRect().mLeft;
+						S32	local_y	= y	- mJumpNextArrowBtn->getRect().mBottom;
+						mJumpNextArrowBtn->handleHover(local_x,	local_y, mask);
+					}
+					if (mPrevArrowBtn->getRect().pointInRect(x,	y))
+					{
+						S32	local_x	= x	- mPrevArrowBtn->getRect().mLeft;
+						S32	local_y	= y	- mPrevArrowBtn->getRect().mBottom;
+						mPrevArrowBtn->handleHover(local_x,	local_y, mask);
+					}
+					else if	(mNextArrowBtn->getRect().pointInRect(x, y))
+					{
+						S32	local_x	= x	- mNextArrowBtn->getRect().mLeft;
+						S32	local_y	= y	- mNextArrowBtn->getRect().mBottom;
+						mNextArrowBtn->handleHover(local_x, local_y, mask);
+					}
+				}
 
-		for(tuple_list_t::iterator iter	= mTabList.begin();	iter !=	 mTabList.end(); ++iter)
-		{
-			LLTabTuple*	tuple =	*iter;
-			tuple->mButton->setVisible(	TRUE );
-			S32	local_x	= x	- tuple->mButton->getRect().mLeft;
-			S32	local_y	= y	- tuple->mButton->getRect().mBottom;
-			if (tuple->mButton->pointInView(local_x, local_y) &&  tuple->mButton->getEnabled() && !tuple->mTabPanel->getVisible())
-			{
-				tuple->mButton->onCommit();
+				for(tuple_list_t::iterator iter	= mTabList.begin();	iter !=	 mTabList.end(); ++iter)
+				{
+					LLTabTuple*	tuple =	*iter;
+					tuple->mButton->setVisible(	TRUE );
+					S32	local_x	= x	- tuple->mButton->getRect().mLeft;
+					S32	local_y	= y	- tuple->mButton->getRect().mBottom;
+					if (tuple->mButton->pointInView(local_x, local_y) &&  tuple->mButton->getEnabled() && !tuple->mTabPanel->getVisible())
+					{
+						tuple->mButton->onCommit();
+					}
+				}
+				// Stop the timer whether successful or not. Don't let it run forever.
 				mDragAndDropDelayTimer.stop();
 			}
 		}
+		else 
+		{
+			// Start a timer so we don't open tabs as soon as we hover on them
+			mDragAndDropDelayTimer.start();
+		}
 	}
 
 	return LLView::handleDragAndDrop(x,	y, mask, drop, type, cargo_data,  accept, tooltip);
@@ -1025,85 +1040,50 @@ void LLTabContainer::addTabPanel(const TabPanelParams& panel)
 	}
 	else
 	{
+		LLButton::Params& p = (mCustomIconCtrlUsed ? custom_btn_params : normal_btn_params);
+		
+		p.rect(btn_rect);
+		p.font(mFont);
+		p.font_halign = mFontHalign;
+		p.label(trimmed_label);
+		p.click_callback.function(boost::bind(&LLTabContainer::onTabBtn, this, _2, child));
+		if (indent)
+		{
+			p.pad_left(indent);
+		}
+		p.pad_bottom( mLabelPadBottom );
+		p.scale_image(true);
+		p.tab_stop(false);
+		p.label_shadow(false);
+		p.follows.flags = FOLLOWS_LEFT;
+		
 		if (mIsVertical)
 		{
-			LLButton::Params& p = (mCustomIconCtrlUsed)?
-					custom_btn_params:normal_btn_params;
-
 			p.name(std::string("vert tab button"));
-			p.rect(btn_rect);
-			p.follows.flags(FOLLOWS_TOP | FOLLOWS_LEFT);
-			p.click_callback.function(boost::bind(&LLTabContainer::onTabBtn, this, _2, child));
-			p.font(mFont);
-			p.label(trimmed_label);
 			p.image_unselected(mMiddleTabParams.tab_left_image_unselected);
 			p.image_selected(mMiddleTabParams.tab_left_image_selected);
-			p.scale_image(true);
-			p.font_halign = mFontHalign;
-			p.pad_bottom( mLabelPadBottom );
-			p.tab_stop(false);
-			p.label_shadow(false);
-			if (indent)
-			{
-				p.pad_left(indent);
-			}
-			
-			
-			if(mCustomIconCtrlUsed)
-			{
-				btn = LLUICtrlFactory::create<LLCustomButtonIconCtrl>(custom_btn_params);
-				
-			}
-			else
-			{
-				btn = LLUICtrlFactory::create<LLButton>(p);
-			}
+			p.follows.flags = p.follows.flags() | FOLLOWS_TOP;
 		}
 		else
 		{
-			LLButton::Params& p = (mCustomIconCtrlUsed)?
-					custom_btn_params:normal_btn_params;
 			p.name(std::string(child->getName()) + " tab");
-			p.rect(btn_rect);
-			p.click_callback.function(boost::bind(&LLTabContainer::onTabBtn, this, _2, child));
-			p.font(mFont);
-			p.label(trimmed_label);
 			p.visible(false);
-			p.scale_image(true);
 			p.image_unselected(tab_img);
 			p.image_selected(tab_selected_img);
-			p.tab_stop(false);
-			p.label_shadow(false);
+			p.follows.flags = p.follows.flags() | (getTabPosition() == TOP ? FOLLOWS_TOP : FOLLOWS_BOTTOM);
 			// Try to squeeze in a bit more text
 			p.pad_left( mLabelPadLeft );
 			p.pad_right(2);
-			p.pad_bottom( mLabelPadBottom );
-			p.font_halign = mFontHalign;
-			p.follows.flags = FOLLOWS_LEFT;
-			p.follows.flags = FOLLOWS_LEFT;
-	
-			if (indent)
-			{
-				p.pad_left(indent);
-			}
-
-			if( getTabPosition() == TOP )
-			{
-				p.follows.flags = p.follows.flags() | FOLLOWS_TOP;
-			}
-			else
-			{
-				p.follows.flags = p.follows.flags() | FOLLOWS_BOTTOM;
-			}
-
-			if(mCustomIconCtrlUsed)
-			{
-				btn = LLUICtrlFactory::create<LLCustomButtonIconCtrl>(custom_btn_params);
-			}
-			else
-			{
-				btn = LLUICtrlFactory::create<LLButton>(p);
-			}
+		}
+		
+		// *TODO : It seems wrong not to use p in both cases considering the way p is initialized
+		if (mCustomIconCtrlUsed)
+		{
+			btn = LLUICtrlFactory::create<LLCustomButtonIconCtrl>(custom_btn_params);
+		}
+		else
+		{
+			btn = LLUICtrlFactory::create<LLButton>(p);
 		}
 	}
 	
@@ -1280,6 +1260,10 @@ void LLTabContainer::enableTabButton(S32 which, BOOL enable)
 	{
 		mTabList[which]->mButton->setEnabled(enable);
 	}
+	// Stop the DaD timer as it might run forever
+	// enableTabButton() is typically called on refresh and draw when anything changed
+	// in the tab container so it's a good time to reset that.
+	mDragAndDropDelayTimer.stop();
 }
 
 void LLTabContainer::deleteAllTabs()
diff --git a/indra/llui/lltabcontainer.h b/indra/llui/lltabcontainer.h
index eaa2fd54e0..cebace2ceb 100644
--- a/indra/llui/lltabcontainer.h
+++ b/indra/llui/lltabcontainer.h
@@ -105,6 +105,11 @@ public:
 		Optional<bool>						use_custom_icon_ctrl;
 
 		/**
+		 * Open tabs on hover in drag and drop situations
+		 */
+		Optional<bool>						open_tabs_on_drag_and_drop;
+		
+		/**
 		 *  Paddings for LLIconCtrl in case of LLCustomButtonIconCtrl usage(use_custom_icon_ctrl = true)
 		 */
 		Optional<S32>						tab_icon_ctrl_pad;
@@ -300,6 +305,7 @@ private:
 	TabParams						mLastTabParams;
 
 	bool							mCustomIconCtrlUsed;
+	bool							mOpenTabsOnDragAndDrop;
 	S32								mTabIconCtrlPad;
 	bool							mUseTabEllipses;
 };
diff --git a/indra/llui/lltextbase.cpp b/indra/llui/lltextbase.cpp
index 919364be63..7aeeae298f 100644
--- a/indra/llui/lltextbase.cpp
+++ b/indra/llui/lltextbase.cpp
@@ -598,7 +598,7 @@ S32 LLTextBase::insertStringNoUndo(S32 pos, const LLWString &wstr, LLTextBase::s
 
 	pos = getEditableIndex(pos, true);
 
-	segment_set_t::iterator seg_iter = getSegIterContaining(pos);
+	segment_set_t::iterator seg_iter = getEditableSegIterContaining(pos);
 
 	LLTextSegmentPtr default_segment;
 
@@ -1192,7 +1192,10 @@ void LLTextBase::reflow()
 
 		// shrink document to minimum size (visible portion of text widget)
 		// to force inlined widgets with follows set to shrink
-		mDocumentView->reshape(mVisibleTextRect.getWidth(), mDocumentView->getRect().getHeight());
+		if (mWordWrap)
+		{
+			mDocumentView->reshape(mVisibleTextRect.getWidth(), mDocumentView->getRect().getHeight());
+		}
 
 		S32 cur_top = 0;
 
@@ -1510,8 +1513,48 @@ void LLTextBase::getSegmentAndOffset( S32 startpos, segment_set_t::iterator* seg
 	}
 }
 
+LLTextBase::segment_set_t::iterator LLTextBase::getEditableSegIterContaining(S32 index)
+{
+	segment_set_t::iterator it = getSegIterContaining(index);
+	segment_set_t::iterator orig_it = it;
+
+	if (it == mSegments.end()) return it;
+
+	if (!(*it)->canEdit() 
+		&& index == (*it)->getStart() 
+		&& it != mSegments.begin())
+	{
+		it--;
+		if ((*it)->canEdit())
+		{
+			return it;
+		}
+	}
+	return orig_it;
+}
+
+LLTextBase::segment_set_t::const_iterator LLTextBase::getEditableSegIterContaining(S32 index) const
+{
+	segment_set_t::const_iterator it = getSegIterContaining(index);
+	segment_set_t::const_iterator orig_it = it;
+	if (it == mSegments.end()) return it;
+
+	if (!(*it)->canEdit() 
+		&& index == (*it)->getStart() 
+		&& it != mSegments.begin())
+	{
+		it--;
+		if ((*it)->canEdit())
+		{
+			return it;
+		}
+	}
+	return orig_it;
+}
+
 LLTextBase::segment_set_t::iterator LLTextBase::getSegIterContaining(S32 index)
 {
+
 	static LLPointer<LLIndexSegment> index_segment = new LLIndexSegment();
 
 	if (index > getLength()) { return mSegments.end(); }
@@ -2117,7 +2160,7 @@ LLRect LLTextBase::getLocalRectFromDocIndex(S32 pos) const
 	{ 
 		// return default height rect in upper left
 		local_rect = content_window_rect;
-		local_rect.mBottom = local_rect.mTop - (S32)(mDefaultFont->getLineHeight());
+		local_rect.mBottom = local_rect.mTop - mDefaultFont->getLineHeight();
 		return local_rect;
 	}
 
@@ -2340,6 +2383,9 @@ S32 LLTextBase::getEditableIndex(S32 index, bool increasing_direction)
 
 void LLTextBase::updateRects()
 {
+	LLRect old_text_rect = mVisibleTextRect;
+	mVisibleTextRect = mScroller ? mScroller->getContentWindowRect() : getLocalRect();
+
 	if (mLineInfoList.empty()) 
 	{
 		mTextBoundingRect = LLRect(0, mVPad, mHPad, 0);
@@ -2355,10 +2401,24 @@ void LLTextBase::updateRects()
 		}
 
 		mTextBoundingRect.mTop += mVPad;
-		// subtract a pixel off the bottom to deal with rounding errors in measuring font height
-		mTextBoundingRect.mBottom -= 1;
 
-		S32 delta_pos = -mTextBoundingRect.mBottom;
+		S32 delta_pos = 0;
+		
+		switch(mVAlign)
+		{
+		case LLFontGL::TOP:
+			delta_pos = llmax(mVisibleTextRect.getHeight() - mTextBoundingRect.mTop, -mTextBoundingRect.mBottom);
+			break;
+		case LLFontGL::VCENTER:
+			delta_pos = (llmax(mVisibleTextRect.getHeight() - mTextBoundingRect.mTop, -mTextBoundingRect.mBottom) + (mVisibleTextRect.mBottom - mTextBoundingRect.mBottom)) / 2;
+			break;
+		case LLFontGL::BOTTOM:
+			delta_pos = mVisibleTextRect.mBottom - mTextBoundingRect.mBottom;
+			break;
+		case LLFontGL::BASELINE:
+			// do nothing
+			break;
+		}
 		// move line segments to fit new document rect
 		for (line_list_t::iterator it = mLineInfoList.begin(); it != mLineInfoList.end(); ++it)
 		{
@@ -2368,8 +2428,9 @@ void LLTextBase::updateRects()
 	}
 
 	// update document container dimensions according to text contents
-	LLRect doc_rect = mTextBoundingRect;
+	LLRect doc_rect;
 	// use old mVisibleTextRect constraint document to width of viewable region
+	doc_rect.mBottom = llmin(mVisibleTextRect.mBottom,  mTextBoundingRect.mBottom);
 	doc_rect.mLeft = 0;
 
 	// allow horizontal scrolling?
@@ -2379,11 +2440,22 @@ void LLTextBase::updateRects()
 	doc_rect.mRight = mScroller 
 		? llmax(mVisibleTextRect.getWidth(), mTextBoundingRect.mRight)
 		: mVisibleTextRect.getWidth();
+	doc_rect.mTop = llmax(mVisibleTextRect.mTop, mTextBoundingRect.mTop);
 
 	if (!mScroller)
 	{
 		// push doc rect to top of text widget
-		doc_rect.translate(0, mVisibleTextRect.getHeight() - doc_rect.mTop);
+		switch(mVAlign)
+		{
+		case LLFontGL::TOP:
+			doc_rect.translate(0, mVisibleTextRect.getHeight() - doc_rect.mTop);
+			break;
+		case LLFontGL::VCENTER:
+			doc_rect.translate(0, (mVisibleTextRect.getHeight() - doc_rect.mTop) / 2);
+		case LLFontGL::BOTTOM:
+		default:
+			break;
+		}
 	}
 
 	mDocumentView->setShape(doc_rect);
@@ -2391,7 +2463,6 @@ void LLTextBase::updateRects()
 	//update mVisibleTextRect *after* mDocumentView has been resized
 	// so that scrollbars are added if document needs to scroll
 	// since mVisibleTextRect does not include scrollbars
-	LLRect old_text_rect = mVisibleTextRect;
 	mVisibleTextRect = mScroller ? mScroller->getContentWindowRect() : getLocalRect();
 	//FIXME: replace border with image?
 	if (mBorderVisible)
@@ -2404,9 +2475,27 @@ void LLTextBase::updateRects()
 	}
 
 	// update document container again, using new mVisibleTextRect (that has scrollbars enabled as needed)
+	doc_rect.mBottom = llmin(mVisibleTextRect.mBottom,  mTextBoundingRect.mBottom);
+	doc_rect.mLeft = 0;
 	doc_rect.mRight = mScroller 
 		? llmax(mVisibleTextRect.getWidth(), mTextBoundingRect.mRight)
 		: mVisibleTextRect.getWidth();
+	doc_rect.mTop = llmax(mVisibleTextRect.mTop, mTextBoundingRect.mTop);
+	if (!mScroller)
+	{
+		// push doc rect to top of text widget
+		switch(mVAlign)
+		{
+		case LLFontGL::TOP:
+			doc_rect.translate(0, mVisibleTextRect.getHeight() - doc_rect.mTop);
+			break;
+		case LLFontGL::VCENTER:
+			doc_rect.translate(0, (mVisibleTextRect.getHeight() - doc_rect.mTop) / 2);
+		case LLFontGL::BOTTOM:
+		default:
+			break;
+		}
+	}
 	mDocumentView->setShape(doc_rect);
 }
 
@@ -2518,7 +2607,10 @@ BOOL LLTextSegment::handleDoubleClick(S32 x, S32 y, MASK mask) { return FALSE; }
 BOOL LLTextSegment::handleHover(S32 x, S32 y, MASK mask) { return FALSE; }
 BOOL LLTextSegment::handleScrollWheel(S32 x, S32 y, S32 clicks) { return FALSE; }
 BOOL LLTextSegment::handleToolTip(S32 x, S32 y, MASK mask) { return FALSE; }
-std::string	LLTextSegment::getName() const { return ""; }
+const std::string&	LLTextSegment::getName() const 
+{
+	return LLStringUtil::null;
+}
 void LLTextSegment::onMouseCaptureLost() {}
 void LLTextSegment::screenPointToLocal(S32 screen_x, S32 screen_y, S32* local_x, S32* local_y) const {}
 void LLTextSegment::localPointToScreen(S32 local_x, S32 local_y, S32* screen_x, S32* screen_y) const {}
@@ -2534,7 +2626,7 @@ LLNormalTextSegment::LLNormalTextSegment( LLStyleConstSP style, S32 start, S32 e
 	mToken(NULL),
 	mEditor(editor)
 {
-	mFontHeight = llceil(mStyle->getFont()->getLineHeight());
+	mFontHeight = mStyle->getFont()->getLineHeight();
 
 	LLUIImagePtr image = mStyle->getImage();
 	if (image.notNull())
@@ -2550,7 +2642,7 @@ LLNormalTextSegment::LLNormalTextSegment( const LLColor4& color, S32 start, S32
 {
 	mStyle = new LLStyle(LLStyle::Params().visible(is_visible).color(color));
 
-	mFontHeight = llceil(mStyle->getFont()->getLineHeight());
+	mFontHeight = mStyle->getFont()->getLineHeight();
 }
 
 LLNormalTextSegment::~LLNormalTextSegment()
@@ -2918,11 +3010,11 @@ LLLineBreakTextSegment::LLLineBreakTextSegment(S32 pos):LLTextSegment(pos,pos+1)
 {
 	LLStyleSP s( new LLStyle(LLStyle::Params().visible(true)));
 
-	mFontHeight = llceil(s->getFont()->getLineHeight());
+	mFontHeight = s->getFont()->getLineHeight();
 }
 LLLineBreakTextSegment::LLLineBreakTextSegment(LLStyleConstSP style,S32 pos):LLTextSegment(pos,pos+1)
 {
-	mFontHeight = llceil(style->getFont()->getLineHeight());
+	mFontHeight = style->getFont()->getLineHeight();
 }
 LLLineBreakTextSegment::~LLLineBreakTextSegment()
 {
@@ -2959,7 +3051,7 @@ static const S32 IMAGE_HPAD = 3;
 bool LLImageTextSegment::getDimensions(S32 first_char, S32 num_chars, S32& width, S32& height) const
 {
 	width = 0;
-	height = llceil(mStyle->getFont()->getLineHeight());;
+	height = mStyle->getFont()->getLineHeight();
 
 	LLUIImagePtr image = mStyle->getImage();
 	if( num_chars>0 && image.notNull())
diff --git a/indra/llui/lltextbase.h b/indra/llui/lltextbase.h
index 384d9116fc..0549141b72 100644
--- a/indra/llui/lltextbase.h
+++ b/indra/llui/lltextbase.h
@@ -84,7 +84,7 @@ public:
 	/*virtual*/ BOOL			handleHover(S32 x, S32 y, MASK mask);
 	/*virtual*/ BOOL			handleScrollWheel(S32 x, S32 y, S32 clicks);
 	/*virtual*/ BOOL			handleToolTip(S32 x, S32 y, MASK mask);
-	/*virtual*/ std::string		getName() const;
+	/*virtual*/ const std::string&	getName() const;
 	/*virtual*/ void			onMouseCaptureLost();
 	/*virtual*/ void			screenPointToLocal(S32 screen_x, S32 screen_y, S32* local_x, S32* local_y) const;
 	/*virtual*/ void			localPointToScreen(S32 local_x, S32 local_y, S32* screen_x, S32* screen_y) const;
@@ -461,6 +461,8 @@ protected:
 	void                			getSegmentAndOffset( S32 startpos, segment_set_t::const_iterator* seg_iter, S32* offsetp ) const;
 	void                			getSegmentAndOffset( S32 startpos, segment_set_t::iterator* seg_iter, S32* offsetp );
 	LLTextSegmentPtr    			getSegmentAtLocalPos( S32 x, S32 y, bool hit_past_end_of_line = true);
+	segment_set_t::iterator			getEditableSegIterContaining(S32 index);
+	segment_set_t::const_iterator	getEditableSegIterContaining(S32 index) const;
 	segment_set_t::iterator			getSegIterContaining(S32 index);
 	segment_set_t::const_iterator	getSegIterContaining(S32 index) const;
 	void                			clearSegments();
diff --git a/indra/llui/lltexteditor.cpp b/indra/llui/lltexteditor.cpp
index 9bd445988d..9720dded6c 100644
--- a/indra/llui/lltexteditor.cpp
+++ b/indra/llui/lltexteditor.cpp
@@ -1332,7 +1332,7 @@ void LLTextEditor::cut()
 	}
 	S32 left_pos = llmin( mSelectionStart, mSelectionEnd );
 	S32 length = llabs( mSelectionStart - mSelectionEnd );
-	gClipboard.copyFromSubstring( getWText(), left_pos, length, mSourceID );
+	LLClipboard::instance().copyToClipboard( getWText(), left_pos, length);
 	deleteSelection( FALSE );
 
 	onKeyStroke();
@@ -1352,12 +1352,12 @@ void LLTextEditor::copy()
 	}
 	S32 left_pos = llmin( mSelectionStart, mSelectionEnd );
 	S32 length = llabs( mSelectionStart - mSelectionEnd );
-	gClipboard.copyFromSubstring(getWText(), left_pos, length, mSourceID);
+	LLClipboard::instance().copyToClipboard(getWText(), left_pos, length);
 }
 
 BOOL LLTextEditor::canPaste() const
 {
-	return !mReadOnly && gClipboard.canPasteString();
+	return !mReadOnly && LLClipboard::instance().isTextAvailable();
 }
 
 // paste from clipboard
@@ -1393,16 +1393,8 @@ void LLTextEditor::pasteHelper(bool is_primary)
 		return;
 	}
 
-	LLUUID source_id;
 	LLWString paste;
-	if (is_primary)
-	{
-		paste = gClipboard.getPastePrimaryWString(&source_id);
-	}
-	else 
-	{
-		paste = gClipboard.getPasteWString(&source_id);
-	}
+	LLClipboard::instance().pasteFromClipboard(paste, is_primary);
 
 	if (paste.empty())
 	{
@@ -1475,12 +1467,12 @@ void LLTextEditor::copyPrimary()
 	}
 	S32 left_pos = llmin( mSelectionStart, mSelectionEnd );
 	S32 length = llabs( mSelectionStart - mSelectionEnd );
-	gClipboard.copyFromPrimarySubstring(getWText(), left_pos, length, mSourceID);
+	LLClipboard::instance().copyToClipboard(getWText(), left_pos, length, true);
 }
 
 BOOL LLTextEditor::canPastePrimary() const
 {
-	return !mReadOnly && gClipboard.canPastePrimaryString();
+	return !mReadOnly && LLClipboard::instance().isTextAvailable(true);
 }
 
 void LLTextEditor::updatePrimary()
@@ -1992,7 +1984,7 @@ void LLTextEditor::drawPreeditMarker()
 		return;
 	}
 		
-	const S32 line_height = llround( mDefaultFont->getLineHeight() );
+	const S32 line_height = mDefaultFont->getLineHeight();
 
 	S32 line_start = getLineStart(cur_line);
 	S32 line_y = mVisibleTextRect.mTop - line_height;
@@ -2250,6 +2242,22 @@ void LLTextEditor::insertText(const std::string &new_text)
 	setEnabled( enabled );
 }
 
+void LLTextEditor::insertText(LLWString &new_text)
+{
+	BOOL enabled = getEnabled();
+	setEnabled( TRUE );
+
+	// Delete any selected characters (the insertion replaces them)
+	if( hasSelection() )
+	{
+		deleteSelection(TRUE);
+	}
+
+	setCursorPos(mCursorPos + insert( mCursorPos, new_text, FALSE, LLTextSegmentPtr() ));
+
+	setEnabled( enabled );
+}
+
 void LLTextEditor::appendWidget(const LLInlineViewSegment::Params& params, const std::string& text, bool allow_undo)
 {
 	// Save old state
@@ -2699,7 +2707,7 @@ BOOL LLTextEditor::getPreeditLocation(S32 query_offset, LLCoordGL *coord, LLRect
 
     const LLWString textString(getWText());
 	const llwchar * const text = textString.c_str();
-	const S32 line_height = llround(mDefaultFont->getLineHeight());
+	const S32 line_height = mDefaultFont->getLineHeight();
 
 	if (coord)
 	{
@@ -2802,7 +2810,7 @@ void LLTextEditor::markAsPreedit(S32 position, S32 length)
 
 S32 LLTextEditor::getPreeditFontSize() const
 {
-	return llround(mDefaultFont->getLineHeight() * LLUI::sGLScaleFactor.mV[VY]);
+	return llround((F32)mDefaultFont->getLineHeight() * LLUI::sGLScaleFactor.mV[VY]);
 }
 
 BOOL LLTextEditor::isDirty() const
@@ -2838,3 +2846,13 @@ void LLTextEditor::clear()
 	getViewModel()->setDisplay(LLWStringUtil::null);
 	clearSegments();
 }
+
+bool LLTextEditor::canLoadOrSaveToFile()
+{
+	return !mReadOnly;
+}
+
+S32 LLTextEditor::spacesPerTab()
+{
+	return SPACES_PER_TAB;
+}
diff --git a/indra/llui/lltexteditor.h b/indra/llui/lltexteditor.h
index 9e4b95003b..40821ae9fb 100644
--- a/indra/llui/lltexteditor.h
+++ b/indra/llui/lltexteditor.h
@@ -92,6 +92,8 @@ public:
 
 	void	setParseHighlights(BOOL parsing) {mParseHighlights=parsing;}
 
+	static S32		spacesPerTab();
+
 	// mousehandler overrides
 	virtual BOOL	handleMouseDown(S32 x, S32 y, MASK mask);
 	virtual BOOL	handleMouseUp(S32 x, S32 y, MASK mask);
@@ -140,6 +142,8 @@ public:
 	virtual void	selectAll();
 	virtual BOOL	canSelectAll()	const;
 
+	virtual bool	canLoadOrSaveToFile();
+
 	void			selectNext(const std::string& search_text_in, BOOL case_insensitive, BOOL wrap = TRUE);
 	BOOL			replaceText(const std::string& search_text, const std::string& replace_text, BOOL case_insensitive, BOOL wrap = TRUE);
 	void			replaceTextAll(const std::string& search_text, const std::string& replace_text, BOOL case_insensitive);
@@ -158,6 +162,7 @@ public:
 
 	// inserts text at cursor
 	void			insertText(const std::string &text);
+	void			insertText(LLWString &text);
 
 	void			appendWidget(const LLInlineViewSegment::Params& params, const std::string& text, bool allow_undo);
 	// Non-undoable
diff --git a/indra/llui/lltextparser.cpp b/indra/llui/lltextparser.cpp
index a4fe4f6ca8..8a85f99e0c 100644
--- a/indra/llui/lltextparser.cpp
+++ b/indra/llui/lltextparser.cpp
@@ -46,8 +46,6 @@ LLTextParser::LLTextParser()
 {}
 
 
-// Moved triggerAlerts() to llfloaterchat.cpp to break llui/llaudio library dependency.
-
 S32 LLTextParser::findPattern(const std::string &text, LLSD highlight)
 {
 	if (!highlight.has("pattern")) return -1;
diff --git a/indra/llui/lltoolbar.cpp b/indra/llui/lltoolbar.cpp
index e7642ae190..81ea0ebf0c 100644
--- a/indra/llui/lltoolbar.cpp
+++ b/indra/llui/lltoolbar.cpp
@@ -151,14 +151,20 @@ void LLToolBar::createContextMenu()
 		if (menu)
 		{
 			menu->setBackgroundColor(LLUIColorTable::instance().getColor("MenuPopupBgColor"));
-
 			mPopupMenuHandle = menu->getHandle();
+			mRemoveButtonHandle = menu->getChild<LLView>("Remove button")->getHandle();
 		}
 		else
 		{
 			llwarns << "Unable to load toolbars context menu." << llendl;
 		}
 	}
+	
+	if (mRemoveButtonHandle.get())
+	{
+		// Disable/Enable the "Remove button" menu item depending on whether or not a button was clicked
+		mRemoveButtonHandle.get()->setEnabled(mRightMouseTargetButton != NULL);
+	}
 }
 
 void LLToolBar::initFromParams(const LLToolBar::Params& p)
@@ -401,6 +407,7 @@ BOOL LLToolBar::handleRightMouseDown(S32 x, S32 y, MASK mask)
 	{
 		// Determine which button the mouse was over during the click in case the context menu action
 		// is intended to affect the button.
+		mRightMouseTargetButton = NULL;
 		BOOST_FOREACH(LLToolBarButton* button, mButtons)
 		{
 			LLRect button_rect;
@@ -770,6 +777,12 @@ void LLToolBar::updateLayoutAsNeeded()
 	// re-center toolbar buttons
 	mCenteringStack->updateLayout();
 
+	if (!mButtons.empty())
+	{
+		mButtonPanel->setVisible(TRUE);
+		mButtonPanel->setMouseOpaque(TRUE);
+	}
+
 	// don't clear flag until after we've resized ourselves, to avoid laying out every frame
 	mNeedsLayout = false;
 }
@@ -814,7 +827,7 @@ void LLToolBar::draw()
 	// rect may have shifted during layout
 	LLUI::popMatrix();
 	LLUI::pushMatrix();
-	LLUI::translate((F32)getRect().mLeft, (F32)getRect().mBottom, 0.f);
+	LLUI::translate((F32)getRect().mLeft, (F32)getRect().mBottom);
 
 	// Position the caret 
 	LLIconCtrl* caret = getChild<LLIconCtrl>("caret");
diff --git a/indra/llui/lltoolbar.h b/indra/llui/lltoolbar.h
index 51fe23ddd1..a50c60282c 100644
--- a/indra/llui/lltoolbar.h
+++ b/indra/llui/lltoolbar.h
@@ -271,6 +271,7 @@ private:
 	LLLayoutStack*					mCenteringStack;
 	LLPanel*						mButtonPanel;
 	LLHandle<class LLContextMenu>	mPopupMenuHandle;
+	LLHandle<class LLView>			mRemoveButtonHandle;
 
 	LLToolBarButton*				mRightMouseTargetButton;
 
diff --git a/indra/llui/lltooltip.cpp b/indra/llui/lltooltip.cpp
index 23cdd9ad9a..f737d48abf 100644
--- a/indra/llui/lltooltip.cpp
+++ b/indra/llui/lltooltip.cpp
@@ -180,6 +180,7 @@ LLToolTip::LLToolTip(const LLToolTip::Params& p)
 	params.font = p.font;
 	params.use_ellipses = true;
 	params.wrap = p.wrap;
+	params.font_valign = LLFontGL::VCENTER;
 	params.parse_urls = false; // disallow hyperlinks in tooltips, as they want to spawn their own explanatory tooltips
 	mTextBox = LLUICtrlFactory::create<LLTextBox> (params);
 	addChild(mTextBox);
@@ -190,7 +191,6 @@ LLToolTip::LLToolTip(const LLToolTip::Params& p)
 	{
 		LLButton::Params icon_params;
 		icon_params.name = "tooltip_info";
-		icon_params.label(""); // provid label but set to empty so name does not overwrite it -angela
 		LLRect icon_rect;
 		LLUIImage* imagep = p.image;
 		TOOLTIP_ICON_SIZE = (imagep ? imagep->getWidth() : 16);
@@ -291,6 +291,12 @@ void LLToolTip::initFromParams(const LLToolTip::Params& p)
 	S32 text_width = llmin(p.max_width(), mTextBox->getTextPixelWidth());
 	S32 text_height = mTextBox->getTextPixelHeight();
 	mTextBox->reshape(text_width, text_height);
+	if (mInfoButton)
+	{
+		LLRect text_rect = mTextBox->getRect();
+		LLRect icon_rect = mInfoButton->getRect();
+		mTextBox->translate(0, icon_rect.getCenterY() - text_rect.getCenterY());
+	}
 
 	// reshape tooltip panel to fit text box
 	LLRect tooltip_rect = calcBoundingRect();
@@ -299,6 +305,8 @@ void LLToolTip::initFromParams(const LLToolTip::Params& p)
 	tooltip_rect.mBottom = 0;
 	tooltip_rect.mLeft = 0;
 
+	mTextBox->reshape(mTextBox->getRect().getWidth(), llmax(mTextBox->getRect().getHeight(), tooltip_rect.getHeight() - 2 * mPadding));
+
 	setShape(tooltip_rect);
 }
 
diff --git a/indra/llui/llui.cpp b/indra/llui/llui.cpp
index 79ad99a770..b5e27616b7 100644
--- a/indra/llui/llui.cpp
+++ b/indra/llui/llui.cpp
@@ -153,11 +153,11 @@ void gl_state_for_2d(S32 width, S32 height)
 	F32 window_width = (F32) width;//gViewerWindow->getWindowWidth();
 	F32 window_height = (F32) height;//gViewerWindow->getWindowHeight();
 
-	glMatrixMode(GL_PROJECTION);
-	glLoadIdentity();
-	glOrtho(0.0f, llmax(window_width, 1.f), 0.0f, llmax(window_height,1.f), -1.0f, 1.0f);
-	glMatrixMode(GL_MODELVIEW);
-	glLoadIdentity();
+	gGL.matrixMode(LLRender::MM_PROJECTION);
+	gGL.loadIdentity();
+	gGL.ortho(0.0f, llmax(window_width, 1.f), 0.0f, llmax(window_height,1.f), -1.0f, 1.0f);
+	gGL.matrixMode(LLRender::MM_MODELVIEW);
+	gGL.loadIdentity();
 	stop_glerror();
 }
 
@@ -537,7 +537,7 @@ void gl_draw_scaled_image_with_border(S32 x, S32 y, S32 width, S32 height, LLTex
 		}
 	}
 
-	gGL.getTexUnit(0)->bind(image);
+	gGL.getTexUnit(0)->bind(image, true);
 
 	gGL.color4fv(color.mV);
 	
@@ -735,7 +735,7 @@ void gl_draw_scaled_rotated_image(S32 x, S32 y, S32 width, S32 height, F32 degre
 	LLGLSUIDefault gls_ui;
 
 
-	gGL.getTexUnit(0)->bind(image);
+	gGL.getTexUnit(0)->bind(image, true);
 
 	gGL.color4fv(color.mV);
 
@@ -788,7 +788,7 @@ void gl_draw_scaled_rotated_image(S32 x, S32 y, S32 width, S32 height, F32 degre
 
 		LLMatrix3 quat(0.f, 0.f, degrees*DEG_TO_RAD);
 		
-		gGL.getTexUnit(0)->bind(image);
+		gGL.getTexUnit(0)->bind(image, true);
 
 		gGL.color4fv(color.mV);
 		
@@ -955,10 +955,12 @@ void gl_ring( F32 radius, F32 width, const LLColor4& center_color, const LLColor
 		if( render_center )
 		{
 			gGL.color4fv(center_color.mV);
+			gGL.diffuseColor4fv(center_color.mV);
 			gl_deep_circle( radius, width, steps );
 		}
 		else
 		{
+			gGL.diffuseColor4fv(side_color.mV);
 			gl_washer_2d(radius, radius - width, steps, side_color, side_color);
 			gGL.translateUI(0.f, 0.f, width);
 			gl_washer_2d(radius - width, radius, steps, side_color, side_color);
@@ -970,35 +972,53 @@ void gl_ring( F32 radius, F32 width, const LLColor4& center_color, const LLColor
 // Draw gray and white checkerboard with black border
 void gl_rect_2d_checkerboard(const LLRect& rect, GLfloat alpha)
 {
-	// Initialize the first time this is called.
-	const S32 PIXELS = 32;
-	static GLubyte checkerboard[PIXELS * PIXELS];
-	static BOOL first = TRUE;
-	if( first )
-	{
-		for( S32 i = 0; i < PIXELS; i++ )
+	if (!LLGLSLShader::sNoFixedFunction)
+	{ 
+		// Initialize the first time this is called.
+		const S32 PIXELS = 32;
+		static GLubyte checkerboard[PIXELS * PIXELS];
+		static BOOL first = TRUE;
+		if( first )
 		{
-			for( S32 j = 0; j < PIXELS; j++ )
+			for( S32 i = 0; i < PIXELS; i++ )
 			{
-				checkerboard[i * PIXELS + j] = ((i & 1) ^ (j & 1)) * 0xFF;
+				for( S32 j = 0; j < PIXELS; j++ )
+				{
+					checkerboard[i * PIXELS + j] = ((i & 1) ^ (j & 1)) * 0xFF;
+				}
 			}
+			first = FALSE;
 		}
-		first = FALSE;
-	}
 	
-	gGL.getTexUnit(0)->unbind(LLTexUnit::TT_TEXTURE);
+		gGL.getTexUnit(0)->unbind(LLTexUnit::TT_TEXTURE);
 
-	// ...white squares
-	gGL.color4f( 1.f, 1.f, 1.f, alpha );
-	gl_rect_2d(rect);
+		// ...white squares
+		gGL.color4f( 1.f, 1.f, 1.f, alpha );
+		gl_rect_2d(rect);
 
-	// ...gray squares
-	gGL.color4f( .7f, .7f, .7f, alpha );
-	gGL.flush();
-	glPolygonStipple( checkerboard );
+		// ...gray squares
+		gGL.color4f( .7f, .7f, .7f, alpha );
+		gGL.flush();
 
-	LLGLEnable polygon_stipple(GL_POLYGON_STIPPLE);
-	gl_rect_2d(rect);
+		glPolygonStipple( checkerboard );
+
+		LLGLEnable polygon_stipple(GL_POLYGON_STIPPLE);
+		gl_rect_2d(rect);
+	}
+	else
+	{ //polygon stipple is deprecated, use "Checker" texture
+		LLPointer<LLUIImage> img = LLUI::getUIImage("Checker");
+		gGL.getTexUnit(0)->bind(img->getImage());
+		gGL.getTexUnit(0)->setTextureAddressMode(LLTexUnit::TAM_WRAP);
+		gGL.getTexUnit(0)->setTextureFilteringOption(LLTexUnit::TFO_POINT);
+
+		LLColor4 color(1.f, 1.f, 1.f, alpha);
+		LLRectf uv_rect(0, 0, rect.getWidth()/32.f, rect.getHeight()/32.f);
+
+		gl_draw_scaled_image(rect.mLeft, rect.mBottom, rect.getWidth(), rect.getHeight(),
+			img->getImage(), color, uv_rect);
+	}
+	
 	gGL.flush();
 }
 
@@ -1678,21 +1698,22 @@ void LLUI::translate(F32 x, F32 y, F32 z)
 	gGL.translateUI(x,y,z);
 	LLFontGL::sCurOrigin.mX += (S32) x;
 	LLFontGL::sCurOrigin.mY += (S32) y;
-	LLFontGL::sCurOrigin.mZ += z;
+	LLFontGL::sCurDepth += z;
 }
 
 //static
 void LLUI::pushMatrix()
 {
 	gGL.pushUIMatrix();
-	LLFontGL::sOriginStack.push_back(LLFontGL::sCurOrigin);
+	LLFontGL::sOriginStack.push_back(std::make_pair(LLFontGL::sCurOrigin, LLFontGL::sCurDepth));
 }
 
 //static
 void LLUI::popMatrix()
 {
 	gGL.popUIMatrix();
-	LLFontGL::sCurOrigin = *LLFontGL::sOriginStack.rbegin();
+	LLFontGL::sCurOrigin = LLFontGL::sOriginStack.back().first;
+	LLFontGL::sCurDepth = LLFontGL::sOriginStack.back().second;
 	LLFontGL::sOriginStack.pop_back();
 }
 
@@ -1702,7 +1723,7 @@ void LLUI::loadIdentity()
 	gGL.loadUIIdentity(); 
 	LLFontGL::sCurOrigin.mX = 0;
 	LLFontGL::sCurOrigin.mY = 0;
-	LLFontGL::sCurOrigin.mZ = 0;
+	LLFontGL::sCurDepth = 0.f;
 }
 
 //static
@@ -1725,10 +1746,7 @@ void LLUI::setMousePositionScreen(S32 x, S32 y)
 	screen_x = llround((F32)x * sGLScaleFactor.mV[VX]);
 	screen_y = llround((F32)y * sGLScaleFactor.mV[VY]);
 	
-	LLCoordWindow window_point;
-	LLView::getWindow()->convertCoords(LLCoordGL(screen_x, screen_y), &window_point);
-
-	LLView::getWindow()->setCursorPosition(window_point);
+	LLView::getWindow()->setCursorPosition(LLCoordGL(screen_x, screen_y).convert());
 }
 
 //static 
@@ -1736,8 +1754,7 @@ void LLUI::getMousePositionScreen(S32 *x, S32 *y)
 {
 	LLCoordWindow cursor_pos_window;
 	getWindow()->getCursorPosition(&cursor_pos_window);
-	LLCoordGL cursor_pos_gl;
-	getWindow()->convertCoords(cursor_pos_window, &cursor_pos_gl);
+	LLCoordGL cursor_pos_gl(cursor_pos_window.convert());
 	*x = llround((F32)cursor_pos_gl.mX / sGLScaleFactor.mV[VX]);
 	*y = llround((F32)cursor_pos_gl.mY / sGLScaleFactor.mV[VX]);
 }
@@ -1823,9 +1840,12 @@ void LLUI::setupPaths()
 	LLXMLNodePtr root;
 	BOOL success  = LLXMLNode::parseFile(filename, root, NULL);
 	Paths paths;
-	LLXUIParser parser;
-	parser.readXUI(root, paths, filename);
 
+	if(success)
+	{
+		LLXUIParser parser;
+		parser.readXUI(root, paths, filename);
+	}
 	sXUIPaths.clear();
 	
 	if (success && paths.validateBlock())
@@ -2039,7 +2059,7 @@ void LLUI::positionViewNearMouse(LLView* view, S32 spawn_x, S32 spawn_y)
 	// Start at spawn position (using left/top)
 	view->setOrigin( local_x, local_y - view->getRect().getHeight());
 	// Make sure we're on-screen and not overlapping the mouse
-	view->translateIntoRectWithExclusion( virtual_window_rect, mouse_rect, FALSE );
+	view->translateIntoRectWithExclusion( virtual_window_rect, mouse_rect );
 }
 
 LLView* LLUI::resolvePath(LLView* context, const std::string& path)
diff --git a/indra/llui/lluictrl.cpp b/indra/llui/lluictrl.cpp
index 2fa260ded1..b9c843e931 100644
--- a/indra/llui/lluictrl.cpp
+++ b/indra/llui/lluictrl.cpp
@@ -118,7 +118,6 @@ LLUICtrl::LLUICtrl(const LLUICtrl::Params& p, const LLViewModelPtr& viewmodel)
 	mDoubleClickSignal(NULL),
 	mTransparencyType(TT_DEFAULT)
 {
-	mUICtrlHandle.bind(this);
 }
 
 void LLUICtrl::initFromParams(const Params& p)
@@ -460,7 +459,7 @@ void LLUICtrl::setControlVariable(LLControlVariable* control)
 	if (control)
 	{
 		mControlVariable = control;
-		mControlConnection = mControlVariable->getSignal()->connect(boost::bind(&controlListener, _2, getUICtrlHandle(), std::string("value")));
+		mControlConnection = mControlVariable->getSignal()->connect(boost::bind(&controlListener, _2, getHandle(), std::string("value")));
 		setValue(mControlVariable->getValue());
 	}
 }
@@ -491,7 +490,7 @@ void LLUICtrl::setEnabledControlVariable(LLControlVariable* control)
 	if (control)
 	{
 		mEnabledControlVariable = control;
-		mEnabledControlConnection = mEnabledControlVariable->getSignal()->connect(boost::bind(&controlListener, _2, getUICtrlHandle(), std::string("enabled")));
+		mEnabledControlConnection = mEnabledControlVariable->getSignal()->connect(boost::bind(&controlListener, _2, getHandle(), std::string("enabled")));
 		setEnabled(mEnabledControlVariable->getValue().asBoolean());
 	}
 }
@@ -506,7 +505,7 @@ void LLUICtrl::setDisabledControlVariable(LLControlVariable* control)
 	if (control)
 	{
 		mDisabledControlVariable = control;
-		mDisabledControlConnection = mDisabledControlVariable->getSignal()->connect(boost::bind(&controlListener, _2, getUICtrlHandle(), std::string("disabled")));
+		mDisabledControlConnection = mDisabledControlVariable->getSignal()->connect(boost::bind(&controlListener, _2, getHandle(), std::string("disabled")));
 		setEnabled(!(mDisabledControlVariable->getValue().asBoolean()));
 	}
 }
@@ -521,7 +520,7 @@ void LLUICtrl::setMakeVisibleControlVariable(LLControlVariable* control)
 	if (control)
 	{
 		mMakeVisibleControlVariable = control;
-		mMakeVisibleControlConnection = mMakeVisibleControlVariable->getSignal()->connect(boost::bind(&controlListener, _2, getUICtrlHandle(), std::string("visible")));
+		mMakeVisibleControlConnection = mMakeVisibleControlVariable->getSignal()->connect(boost::bind(&controlListener, _2, getHandle(), std::string("visible")));
 		setVisible(mMakeVisibleControlVariable->getValue().asBoolean());
 	}
 }
@@ -536,7 +535,7 @@ void LLUICtrl::setMakeInvisibleControlVariable(LLControlVariable* control)
 	if (control)
 	{
 		mMakeInvisibleControlVariable = control;
-		mMakeInvisibleControlConnection = mMakeInvisibleControlVariable->getSignal()->connect(boost::bind(&controlListener, _2, getUICtrlHandle(), std::string("invisible")));
+		mMakeInvisibleControlConnection = mMakeInvisibleControlVariable->getSignal()->connect(boost::bind(&controlListener, _2, getHandle(), std::string("invisible")));
 		setVisible(!(mMakeInvisibleControlVariable->getValue().asBoolean()));
 	}
 }
diff --git a/indra/llui/lluictrl.h b/indra/llui/lluictrl.h
index 3e055a9d06..fb2196bb16 100644
--- a/indra/llui/lluictrl.h
+++ b/indra/llui/lluictrl.h
@@ -223,7 +223,7 @@ public:
 	BOOL	focusLastItem(BOOL prefer_text_fields = FALSE);
 
 	// Non Virtuals
-	LLHandle<LLUICtrl> getUICtrlHandle() const { return mUICtrlHandle; }
+	LLHandle<LLUICtrl> getHandle() const { return getDerivedHandle<LLUICtrl>(); }
 	BOOL			getIsChrome() const;
 	
 	void			setTabStop( BOOL b );
@@ -313,7 +313,6 @@ private:
 	BOOL			mRequestsFront;
 	BOOL			mTabStop;
 	BOOL			mTentative;
-	LLRootHandle<LLUICtrl> mUICtrlHandle;
 
 	ETypeTransparency mTransparencyType;
 
diff --git a/indra/llui/lluistring.cpp b/indra/llui/lluistring.cpp
index ac69d3bf85..c4e073ccdb 100644
--- a/indra/llui/lluistring.cpp
+++ b/indra/llui/lluistring.cpp
@@ -128,17 +128,13 @@ void LLUIString::updateResult() const
 	}
 	mResult = mOrig;
 	
-	// get the defailt args + local args
-	if (!mArgs || mArgs->empty())
+	// get the default args + local args
+	LLStringUtil::format_map_t combined_args = LLTrans::getDefaultArgs();
+	if (mArgs && !mArgs->empty())
 	{
-		LLStringUtil::format(mResult, LLTrans::getDefaultArgs());
-	}
-	else
-	{
-		LLStringUtil::format_map_t combined_args = LLTrans::getDefaultArgs();
 		combined_args.insert(mArgs->begin(), mArgs->end());
-		LLStringUtil::format(mResult, combined_args);
 	}
+	LLStringUtil::format(mResult, combined_args);
 }
 
 void LLUIString::updateWResult() const
diff --git a/indra/llui/llview.cpp b/indra/llui/llview.cpp
index 3fd7e48428..54843227b7 100644
--- a/indra/llui/llview.cpp
+++ b/indra/llui/llview.cpp
@@ -121,6 +121,7 @@ LLView::Params::Params()
 
 LLView::LLView(const LLView::Params& p)
 :	mVisible(p.visible),
+	mInDraw(false),
 	mName(p.name),
 	mParentView(NULL),
 	mReshapeFlags(FOLLOWS_NONE),
@@ -225,9 +226,11 @@ BOOL LLView::getUseBoundingRect() const
 }
 
 // virtual
-std::string LLView::getName() const
+const std::string& LLView::getName() const
 {
-	return mName.empty() ? std::string("(no name)") : mName;
+	static std::string no_name("(no name)");
+
+	return mName.empty() ? no_name : mName;
 }
 
 void LLView::sendChildToFront(LLView* child)
@@ -331,6 +334,8 @@ void LLView::removeChild(LLView* child)
 	//llassert_always(sDepth == 0); // Avoid re-ordering while drawing; it can cause subtle iterator bugs
 	if (child->mParentView == this) 
 	{
+		// if we are removing an item we are currently iterating over, that would be bad
+		llassert(child->mInDraw == false);
 		mChildList.remove( child );
 		child->mParentView = NULL;
 		if (child->isCtrl())
@@ -1088,6 +1093,11 @@ void LLView::drawChildren()
 		{
 			child_list_reverse_iter_t child = child_iter++;
 			LLView *viewp = *child;
+			
+			if (viewp == NULL)
+			{
+				continue;
+			}
 
 			if (viewp->getVisible() && viewp->getRect().isValid())
 			{
@@ -1096,8 +1106,11 @@ void LLView::drawChildren()
 				{
 					LLUI::pushMatrix();
 					{
-						LLUI::translate((F32)viewp->getRect().mLeft, (F32)viewp->getRect().mBottom, 0.f);
+						LLUI::translate((F32)viewp->getRect().mLeft, (F32)viewp->getRect().mBottom);
+						// flag the fact we are in draw here, in case overridden draw() method attempts to remove this widget
+						viewp->mInDraw = true;
 						viewp->draw();
+						viewp->mInDraw = false;
 
 						if (sDebugRects)
 						{
@@ -1146,7 +1159,7 @@ void LLView::drawDebugRect()
 
 		if (getUseBoundingRect())
 		{
-			LLUI::translate((F32)mBoundingRect.mLeft - (F32)mRect.mLeft, (F32)mBoundingRect.mBottom - (F32)mRect.mBottom, 0.f);
+			LLUI::translate((F32)mBoundingRect.mLeft - (F32)mRect.mLeft, (F32)mBoundingRect.mBottom - (F32)mRect.mBottom);
 		}
 
 		LLRect debug_rect = getUseBoundingRect() ? mBoundingRect : mRect;
@@ -1215,10 +1228,10 @@ void LLView::drawChild(LLView* childp, S32 x_offset, S32 y_offset, BOOL force_dr
 		if ((childp->getVisible() && childp->getRect().isValid()) 
 			|| force_draw)
 		{
-			glMatrixMode(GL_MODELVIEW);
+			gGL.matrixMode(LLRender::MM_MODELVIEW);
 			LLUI::pushMatrix();
 			{
-				LLUI::translate((F32)childp->getRect().mLeft + x_offset, (F32)childp->getRect().mBottom + y_offset, 0.f);
+				LLUI::translate((F32)childp->getRect().mLeft + x_offset, (F32)childp->getRect().mBottom + y_offset);
 				childp->draw();
 			}
 			LLUI::popMatrix();
@@ -1287,7 +1300,10 @@ void LLView::reshape(S32 width, S32 height, BOOL called_from_parent)
 			S32 delta_x = child_rect.mLeft - viewp->getRect().mLeft;
 			S32 delta_y = child_rect.mBottom - viewp->getRect().mBottom;
 			viewp->translate( delta_x, delta_y );
-			viewp->reshape(child_rect.getWidth(), child_rect.getHeight());
+			if (child_rect.getWidth() != viewp->getRect().getWidth() || child_rect.getHeight() != viewp->getRect().getHeight())
+			{
+				viewp->reshape(child_rect.getWidth(), child_rect.getHeight());
+			}
 		}
 	}
 
@@ -1603,59 +1619,30 @@ LLView* LLView::findNextSibling(LLView* child)
 }
 
 
-LLCoordGL getNeededTranslation(const LLRect& input, const LLRect& constraint, BOOL allow_partial_outside)
+LLCoordGL getNeededTranslation(const LLRect& input, const LLRect& constraint, S32 min_overlap_pixels)
 {
 	LLCoordGL delta;
 
-	if (allow_partial_outside)
-	{
-		const S32 KEEP_ONSCREEN_PIXELS = 16;
+	const S32 KEEP_ONSCREEN_PIXELS_WIDTH = llmin(min_overlap_pixels, input.getWidth());
+	const S32 KEEP_ONSCREEN_PIXELS_HEIGHT = llmin(min_overlap_pixels, input.getHeight());
 
-		if( input.mRight - KEEP_ONSCREEN_PIXELS < constraint.mLeft )
-		{
-			delta.mX = constraint.mLeft - (input.mRight - KEEP_ONSCREEN_PIXELS);
-		}
-		else
-		if( input.mLeft + KEEP_ONSCREEN_PIXELS > constraint.mRight )
-		{
-			delta.mX = constraint.mRight - (input.mLeft + KEEP_ONSCREEN_PIXELS);
-		}
+	if( input.mRight - KEEP_ONSCREEN_PIXELS_WIDTH < constraint.mLeft )
+	{
+		delta.mX = constraint.mLeft - (input.mRight - KEEP_ONSCREEN_PIXELS_WIDTH);
+	}
+	else if( input.mLeft + KEEP_ONSCREEN_PIXELS_WIDTH > constraint.mRight )
+	{
+		delta.mX = constraint.mRight - (input.mLeft + KEEP_ONSCREEN_PIXELS_WIDTH);
+	}
 
-		if( input.mTop > constraint.mTop )
-		{
-			delta.mY = constraint.mTop - input.mTop;
-		}
-		else
-		if( input.mTop - KEEP_ONSCREEN_PIXELS < constraint.mBottom )
-		{
-			delta.mY = constraint.mBottom - (input.mTop - KEEP_ONSCREEN_PIXELS);
-		}
+	if( input.mTop > constraint.mTop )
+	{
+		delta.mY = constraint.mTop - input.mTop;
 	}
 	else
+	if( input.mTop - KEEP_ONSCREEN_PIXELS_HEIGHT < constraint.mBottom )
 	{
-		if( input.mLeft < constraint.mLeft )
-		{
-			delta.mX = constraint.mLeft - input.mLeft;
-		}
-		else
-		if( input.mRight > constraint.mRight )
-		{
-			delta.mX = constraint.mRight - input.mRight;
-			// compensate for left edge possible going off screen
-			delta.mX += llmax( 0, input.getWidth() - constraint.getWidth() );
-		}
-
-		if( input.mTop > constraint.mTop )
-		{
-			delta.mY = constraint.mTop - input.mTop;
-		}
-		else
-		if( input.mBottom < constraint.mBottom )
-		{
-			delta.mY = constraint.mBottom - input.mBottom;
-			// compensate for top edge possible going off screen
-			delta.mY -= llmax( 0, input.getHeight() - constraint.getHeight() );
-		}
+		delta.mY = constraint.mBottom - (input.mTop - KEEP_ONSCREEN_PIXELS_HEIGHT);
 	}
 
 	return delta;
@@ -1664,9 +1651,9 @@ LLCoordGL getNeededTranslation(const LLRect& input, const LLRect& constraint, BO
 // Moves the view so that it is entirely inside of constraint.
 // If the view will not fit because it's too big, aligns with the top and left.
 // (Why top and left?  That's where the drag bars are for floaters.)
-BOOL LLView::translateIntoRect(const LLRect& constraint, BOOL allow_partial_outside )
+BOOL LLView::translateIntoRect(const LLRect& constraint, S32 min_overlap_pixels)
 {
-	LLCoordGL translation = getNeededTranslation(getRect(), constraint, allow_partial_outside);
+	LLCoordGL translation = getNeededTranslation(getRect(), constraint, min_overlap_pixels);
 
 	if (translation.mX != 0 || translation.mY != 0)
 	{
@@ -1678,9 +1665,9 @@ BOOL LLView::translateIntoRect(const LLRect& constraint, BOOL allow_partial_outs
 
 // move this view into "inside" but not onto "exclude"
 // NOTE: if this view is already contained in "inside", we ignore the "exclude" rect
-BOOL LLView::translateIntoRectWithExclusion( const LLRect& inside, const LLRect& exclude, BOOL allow_partial_outside )
+BOOL LLView::translateIntoRectWithExclusion( const LLRect& inside, const LLRect& exclude, S32 min_overlap_pixels)
 {
-	LLCoordGL translation = getNeededTranslation(getRect(), inside, allow_partial_outside);
+	LLCoordGL translation = getNeededTranslation(getRect(), inside, min_overlap_pixels);
 	
 	if (translation.mX != 0 || translation.mY != 0)
 	{
@@ -1848,7 +1835,10 @@ const LLCtrlQuery & LLView::getFocusRootsQuery()
 
 void	LLView::setShape(const LLRect& new_rect, bool by_user)
 {
-	handleReshape(new_rect, by_user);
+	if (new_rect != getRect())
+	{
+		handleReshape(new_rect, by_user);
+	}
 }
 
 void LLView::handleReshape(const LLRect& new_rect, bool by_user)
@@ -2238,145 +2228,163 @@ static bool get_last_child_rect(LLView* parent, LLRect *rect)
 }
 
 //static
-void LLView::applyXUILayout(LLView::Params& p, LLView* parent)
+void LLView::applyXUILayout(LLView::Params& p, LLView* parent, LLRect layout_rect)
 {
+	if (!parent) return;
+
 	const S32 VPAD = 4;
 	const S32 MIN_WIDGET_HEIGHT = 10;
 	
 	// *NOTE:  This will confuse export of floater/panel coordinates unless
 	// the default is also "topleft".  JC
-	if (p.layout().empty() && parent)
+	if (p.layout().empty())
 	{
 		p.layout = parent->getLayout();
 	}
 
-	if (parent)
+	if (layout_rect.isEmpty())
 	{
-		LLRect parent_rect = parent->getLocalRect();
-		// overwrite uninitialized rect params, using context
-		LLRect default_rect = parent->getLocalRect();
+		layout_rect = parent->getLocalRect();
+	}
 
-		bool layout_topleft = (p.layout() == "topleft");
+	// overwrite uninitialized rect params, using context
+	LLRect default_rect = parent->getLocalRect();
 
-		// convert negative or centered coordinates to parent relative values
-		// Note: some of this logic matches the logic in TypedParam<LLRect>::setValueFromBlock()
-		if (p.rect.left.isProvided() && p.rect.left < 0) p.rect.left = p.rect.left + parent_rect.getWidth();
-		if (p.rect.right.isProvided() && p.rect.right < 0) p.rect.right = p.rect.right + parent_rect.getWidth();
-		if (p.rect.bottom.isProvided() && p.rect.bottom < 0) p.rect.bottom = p.rect.bottom + parent_rect.getHeight();
-		if (p.rect.top.isProvided() && p.rect.top < 0) p.rect.top = p.rect.top + parent_rect.getHeight();
+	bool layout_topleft = (p.layout() == "topleft");
 
+	// convert negative or centered coordinates to parent relative values
+	// Note: some of this logic matches the logic in TypedParam<LLRect>::setValueFromBlock()
+	if (p.rect.left.isProvided()) 
+	{
+		p.rect.left = p.rect.left + ((p.rect.left >= 0) ? layout_rect.mLeft : layout_rect.mRight);
+	}
+	if (p.rect.right.isProvided())
+	{
+		p.rect.right = p.rect.right + ((p.rect.right >= 0) ? layout_rect.mLeft : layout_rect.mRight);
+	}
+	if (p.rect.bottom.isProvided()) 
+	{
+		p.rect.bottom = p.rect.bottom + ((p.rect.bottom >= 0) ? layout_rect.mBottom : layout_rect.mTop);
 		if (layout_topleft)
 		{
 			//invert top to bottom
-			if (p.rect.top.isProvided()) p.rect.top = parent_rect.getHeight() - p.rect.top;
-			if (p.rect.bottom.isProvided()) p.rect.bottom = parent_rect.getHeight() - p.rect.bottom;
+			p.rect.bottom = layout_rect.mBottom + layout_rect.mTop - p.rect.bottom;
 		}
-
-		// DEPRECATE: automatically fall back to height of MIN_WIDGET_HEIGHT pixels
-		if (!p.rect.height.isProvided() && !p.rect.top.isProvided() && p.rect.height == 0)
+	}
+	if (p.rect.top.isProvided())
+	{
+		p.rect.top = p.rect.top + ((p.rect.top >= 0) ? layout_rect.mBottom : layout_rect.mTop);
+		if (layout_topleft)
 		{
-			p.rect.height = MIN_WIDGET_HEIGHT;
+			//invert top to bottom
+			p.rect.top = layout_rect.mBottom + layout_rect.mTop - p.rect.top;
 		}
+	}
 
-		default_rect.translate(0, default_rect.getHeight());
+	// DEPRECATE: automatically fall back to height of MIN_WIDGET_HEIGHT pixels
+	if (!p.rect.height.isProvided() && !p.rect.top.isProvided() && p.rect.height == 0)
+	{
+		p.rect.height = MIN_WIDGET_HEIGHT;
+	}
 
-		// If there was a recently constructed child, use its rectangle
-		get_last_child_rect(parent, &default_rect);
+	default_rect.translate(0, default_rect.getHeight());
 
-		if (layout_topleft)
+	// If there was a recently constructed child, use its rectangle
+	get_last_child_rect(parent, &default_rect);
+
+	if (layout_topleft)
+	{
+		// Invert the sense of bottom_delta for topleft layout
+		if (p.bottom_delta.isProvided())
 		{
-			// Invert the sense of bottom_delta for topleft layout
-			if (p.bottom_delta.isProvided())
-			{
-				p.bottom_delta = -p.bottom_delta;
-			}
-			else if (p.top_pad.isProvided()) 
-			{
-				p.bottom_delta = -(p.rect.height + p.top_pad);
-			}
-			else if (p.top_delta.isProvided())
-			{
-				p.bottom_delta =
-					-(p.top_delta + p.rect.height - default_rect.getHeight());
-			}
-			else if (!p.left_delta.isProvided()
-					 && !p.left_pad.isProvided())
-			{
-				// set default position is just below last rect
-				p.bottom_delta.set(-(p.rect.height + VPAD), false);
-			}
-			else
-			{
-				p.bottom_delta.set(0, false);
-			}
-	
-			// default to same left edge
-			if (!p.left_delta.isProvided())
-			{
-				p.left_delta.set(0, false);
-			}
-			if (p.left_pad.isProvided())
-			{
-				// left_pad is based on prior widget's right edge
-				p.left_delta.set(p.left_pad + default_rect.getWidth(), false);
-			}
-			
-			default_rect.translate(p.left_delta, p.bottom_delta);				
+			p.bottom_delta = -p.bottom_delta;
 		}
-		else
-		{	
-			// set default position is just below last rect
-			if (!p.bottom_delta.isProvided())
-			{
-				p.bottom_delta.set(-(p.rect.height + VPAD), false);
-			}
-			if (!p.left_delta.isProvided())
-			{
-				p.left_delta.set(0, false);
-			}
-			default_rect.translate(p.left_delta, p.bottom_delta);
+		else if (p.top_pad.isProvided()) 
+		{
+			p.bottom_delta = -(p.rect.height + p.top_pad);
 		}
-
-		// this handles case where *both* x and x_delta are provided
-		// ignore x in favor of default x + x_delta
-		if (p.bottom_delta.isProvided()) p.rect.bottom.set(0, false);
-		if (p.left_delta.isProvided()) p.rect.left.set(0, false);
-
-		// selectively apply rectangle defaults, making sure that
-		// params are not flagged as having been "provided"
-		// as rect params are overconstrained and rely on provided flags
-		if (!p.rect.left.isProvided())
+		else if (p.top_delta.isProvided())
 		{
-			p.rect.left.set(default_rect.mLeft, false);
-			//HACK: get around the fact that setting a rect param component value won't invalidate the existing rect object value
-			p.rect.paramChanged(p.rect.left, true);
+			p.bottom_delta =
+				-(p.top_delta + p.rect.height - default_rect.getHeight());
 		}
-		if (!p.rect.bottom.isProvided())
+		else if (!p.left_delta.isProvided()
+					&& !p.left_pad.isProvided())
 		{
-			p.rect.bottom.set(default_rect.mBottom, false);
-			p.rect.paramChanged(p.rect.bottom, true);
+			// set default position is just below last rect
+			p.bottom_delta.set(-(p.rect.height + VPAD), false);
 		}
-		if (!p.rect.top.isProvided())
+		else
 		{
-			p.rect.top.set(default_rect.mTop, false);
-			p.rect.paramChanged(p.rect.top, true);
+			p.bottom_delta.set(0, false);
 		}
-		if (!p.rect.right.isProvided())
+	
+		// default to same left edge
+		if (!p.left_delta.isProvided())
 		{
-			p.rect.right.set(default_rect.mRight, false);
-			p.rect.paramChanged(p.rect.right, true);
-
+			p.left_delta.set(0, false);
 		}
-		if (!p.rect.width.isProvided())
+		if (p.left_pad.isProvided())
 		{
-			p.rect.width.set(default_rect.getWidth(), false);
-			p.rect.paramChanged(p.rect.width, true);
+			// left_pad is based on prior widget's right edge
+			p.left_delta.set(p.left_pad + default_rect.getWidth(), false);
 		}
-		if (!p.rect.height.isProvided())
+			
+		default_rect.translate(p.left_delta, p.bottom_delta);				
+	}
+	else
+	{	
+		// set default position is just below last rect
+		if (!p.bottom_delta.isProvided())
+		{
+			p.bottom_delta.set(-(p.rect.height + VPAD), false);
+		}
+		if (!p.left_delta.isProvided())
 		{
-			p.rect.height.set(default_rect.getHeight(), false);
-			p.rect.paramChanged(p.rect.height, true);
+			p.left_delta.set(0, false);
 		}
+		default_rect.translate(p.left_delta, p.bottom_delta);
+	}
+
+	// this handles case where *both* x and x_delta are provided
+	// ignore x in favor of default x + x_delta
+	if (p.bottom_delta.isProvided()) p.rect.bottom.set(0, false);
+	if (p.left_delta.isProvided()) p.rect.left.set(0, false);
+
+	// selectively apply rectangle defaults, making sure that
+	// params are not flagged as having been "provided"
+	// as rect params are overconstrained and rely on provided flags
+	if (!p.rect.left.isProvided())
+	{
+		p.rect.left.set(default_rect.mLeft, false);
+		//HACK: get around the fact that setting a rect param component value won't invalidate the existing rect object value
+		p.rect.paramChanged(p.rect.left, true);
+	}
+	if (!p.rect.bottom.isProvided())
+	{
+		p.rect.bottom.set(default_rect.mBottom, false);
+		p.rect.paramChanged(p.rect.bottom, true);
+	}
+	if (!p.rect.top.isProvided())
+	{
+		p.rect.top.set(default_rect.mTop, false);
+		p.rect.paramChanged(p.rect.top, true);
+	}
+	if (!p.rect.right.isProvided())
+	{
+		p.rect.right.set(default_rect.mRight, false);
+		p.rect.paramChanged(p.rect.right, true);
+
+	}
+	if (!p.rect.width.isProvided())
+	{
+		p.rect.width.set(default_rect.getWidth(), false);
+		p.rect.paramChanged(p.rect.width, true);
+	}
+	if (!p.rect.height.isProvided())
+	{
+		p.rect.height.set(default_rect.getHeight(), false);
+		p.rect.paramChanged(p.rect.height, true);
 	}
 }
 
diff --git a/indra/llui/llview.h b/indra/llui/llview.h
index 08828e55e6..1c35349510 100644
--- a/indra/llui/llview.h
+++ b/indra/llui/llview.h
@@ -97,7 +97,11 @@ private:
 	static std::vector<LLViewDrawContext*> sDrawContextStack;
 };
 
-class LLView : public LLMouseHandler, public LLMortician, public LLFocusableElement
+class LLView 
+:	public LLMouseHandler,			// handles mouse events
+	public LLFocusableElement,		// handles keyboard events
+	public LLMortician,				// lazy deletion
+	public LLHandleProvider<LLView>	// passes out weak references to self
 {
 public:
 	struct Follows : public LLInitParam::ChoiceBlock<Follows>
@@ -306,8 +310,6 @@ public:
 	void			popVisible()				{ setVisible(mLastVisible); }
 	BOOL			getLastVisible()	const	{ return mLastVisible; }
 
-	LLHandle<LLView>	getHandle()				{ mHandle.bind(this); return mHandle; }
-
 	U32			getFollows() const				{ return mReshapeFlags; }
 	BOOL		followsLeft() const				{ return mReshapeFlags & FOLLOWS_LEFT; }
 	BOOL		followsRight() const			{ return mReshapeFlags & FOLLOWS_RIGHT; }
@@ -368,8 +370,8 @@ public:
 	virtual void	reshape(S32 width, S32 height, BOOL called_from_parent = TRUE);
 	virtual void	translate( S32 x, S32 y );
 	void			setOrigin( S32 x, S32 y )	{ mRect.translate( x - mRect.mLeft, y - mRect.mBottom ); }
-	BOOL			translateIntoRect( const LLRect& constraint, BOOL allow_partial_outside );
-	BOOL			translateIntoRectWithExclusion( const LLRect& inside, const LLRect& exclude, BOOL allow_partial_outside );
+	BOOL			translateIntoRect( const LLRect& constraint, S32 min_overlap_pixels = S32_MAX);
+	BOOL			translateIntoRectWithExclusion( const LLRect& inside, const LLRect& exclude, S32 min_overlap_pixels = S32_MAX);
 	void			centerWithin(const LLRect& bounds);
 
 	void	setShape(const LLRect& new_rect, bool by_user = false);
@@ -431,7 +433,7 @@ public:
 	/*virtual*/ BOOL	handleRightMouseUp(S32 x, S32 y, MASK mask);	
 	/*virtual*/ BOOL	handleToolTip(S32 x, S32 y, MASK mask);
 
-	/*virtual*/ std::string	getName() const;
+	/*virtual*/ const std::string& getName() const;
 	/*virtual*/ void	onMouseCaptureLost();
 	/*virtual*/ BOOL	hasMouseCapture();
 	/*virtual*/ void	screenPointToLocal(S32 screen_x, S32 screen_y, S32* local_x, S32* local_y) const;
@@ -503,7 +505,7 @@ public:
 
 	// Set up params after XML load before calling new(),
 	// usually to adjust layout.
-	static void applyXUILayout(Params& p, LLView* parent);
+	static void applyXUILayout(Params& p, LLView* parent, LLRect layout_rect = LLRect());
 
 	// For re-export of floaters and panels, convert the coordinate system
 	// to be top-left based.
@@ -606,11 +608,12 @@ private:
 	BOOL		mIsFocusRoot;
 	BOOL		mUseBoundingRect; // hit test against bounding rectangle that includes all child elements
 
-	LLRootHandle<LLView> mHandle;
 	BOOL		mLastVisible;
 
 	S32			mNextInsertionOrdinal;
 
+	bool		mInDraw;
+
 	static LLWindow* sWindow;	// All root views must know about their window.
 
 	typedef std::map<std::string, LLView*> default_widget_map_t;
diff --git a/indra/llui/llwindowshade.cpp b/indra/llui/llwindowshade.cpp
index cf76202215..f5c463c961 100644
--- a/indra/llui/llwindowshade.cpp
+++ b/indra/llui/llwindowshade.cpp
@@ -37,10 +37,13 @@
 const S32 MIN_NOTIFICATION_AREA_HEIGHT = 30;
 const S32 MAX_NOTIFICATION_AREA_HEIGHT = 100;
 
+static LLDefaultChildRegistry::Register<LLWindowShade> r("window_shade");
+
 LLWindowShade::Params::Params()
 :	bg_image("bg_image"),
 	modal("modal", false),
 	text_color("text_color"),
+	shade_color("shade_color"),
 	can_close("can_close", true)
 {
 	changeDefault(mouse_opaque, false);
@@ -48,7 +51,6 @@ LLWindowShade::Params::Params()
 
 LLWindowShade::LLWindowShade(const LLWindowShade::Params& params)
 :	LLUICtrl(params),
-	mNotification(params.notification),
 	mModal(params.modal),
 	mFormHeight(0),
 	mTextColor(params.text_color)
@@ -72,7 +74,7 @@ void LLWindowShade::initFromParams(const LLWindowShade::Params& params)
 	addChild(stackp);
 
 	LLLayoutPanel::Params panel_p;
-	panel_p.rect = LLRect(0, 30, 800, 0);
+	panel_p.rect = LLRect(0, MIN_NOTIFICATION_AREA_HEIGHT, 800, 0);
 	panel_p.name = "notification_area";
 	panel_p.visible = false;
 	panel_p.user_resize = false;
@@ -89,7 +91,7 @@ void LLWindowShade::initFromParams(const LLWindowShade::Params& params)
 	panel_p.name = "background_area";
 	panel_p.mouse_opaque = false;
 	panel_p.background_visible = false;
-	panel_p.bg_alpha_color = LLColor4(0.f, 0.f, 0.f, 0.2f);
+	panel_p.bg_alpha_color = params.shade_color;
 	LLLayoutPanel* dummy_panel = LLUICtrlFactory::create<LLLayoutPanel>(panel_p);
 	stackp->addChild(dummy_panel);
 
@@ -107,11 +109,11 @@ void LLWindowShade::initFromParams(const LLWindowShade::Params& params)
 
 	LLIconCtrl::Params icon_p;
 	icon_p.name = "notification_icon";
-	icon_p.rect = LLRect(5, 23, 21, 8);
+	icon_p.rect = LLRect(5, 25, 21, 10);
 	panel->addChild(LLUICtrlFactory::create<LLIconCtrl>(icon_p));
 
 	LLTextBox::Params text_p;
-	text_p.rect = LLRect(31, 20, panel->getRect().getWidth() - 5, 0);
+	text_p.rect = LLRect(31, 23, panel->getRect().getWidth() - 5, 3);
 	text_p.follows.flags = FOLLOWS_ALL;
 	text_p.text_color = mTextColor;
 	text_p.font = LLFontGL::getFontSansSerifSmall();
@@ -125,41 +127,132 @@ void LLWindowShade::initFromParams(const LLWindowShade::Params& params)
 	panel_p.auto_resize = false;
 	panel_p.user_resize = false;
 	panel_p.name="form_elements";
-	panel_p.rect = LLRect(0, 30, 130, 0);
+	panel_p.rect = LLRect(0, MIN_NOTIFICATION_AREA_HEIGHT, 130, 0);
 	LLLayoutPanel* form_elements_panel = LLUICtrlFactory::create<LLLayoutPanel>(panel_p);
 	stackp->addChild(form_elements_panel);
 
-	if (params.can_close)
+	panel_p = LLUICtrlFactory::getDefaultParams<LLLayoutPanel>();
+	panel_p.auto_resize = false;
+	panel_p.user_resize = false;
+	panel_p.rect = LLRect(0, MIN_NOTIFICATION_AREA_HEIGHT, 25, 0);
+	panel_p.name = "close_panel";
+	LLLayoutPanel* close_panel = LLUICtrlFactory::create<LLLayoutPanel>(panel_p);
+	stackp->addChild(close_panel);
+
+	LLButton::Params button_p;
+	button_p.name = "close_notification";
+	button_p.rect = LLRect(5, 23, 21, 7);
+	button_p.image_color.control="DkGray_66";
+	button_p.image_unselected.name="Icon_Close_Foreground";
+	button_p.image_selected.name="Icon_Close_Press";
+	button_p.click_callback.function = boost::bind(&LLWindowShade::onCloseNotification, this);
+
+	close_panel->addChild(LLUICtrlFactory::create<LLButton>(button_p));
+	
+	close_panel->setVisible(params.can_close);
+}
+
+void LLWindowShade::draw()
+{
+	LLRect message_rect = getChild<LLTextBox>("notification_text")->getTextBoundingRect();
+
+	LLLayoutPanel* notification_area = getChild<LLLayoutPanel>("notification_area");
+
+	notification_area->reshape(notification_area->getRect().getWidth(), 
+		llclamp(message_rect.getHeight() + 15, 
+				llmax(mFormHeight, MIN_NOTIFICATION_AREA_HEIGHT),
+				MAX_NOTIFICATION_AREA_HEIGHT));
+
+	LLUICtrl::draw();
+
+	while(!mNotifications.empty() && !mNotifications.back()->isActive())
+	{
+		mNotifications.pop_back();
+		// go ahead and hide 
+		hide();
+	}
+
+	if (mNotifications.empty())
+	{
+		hide();
+	}
+	else if (notification_area->getVisibleAmount() < 0.01f)
+	{
+		displayLatestNotification();
+	}
+
+	if (!notification_area->getVisible() && (notification_area->getVisibleAmount() < 0.001f))
 	{
-		panel_p = LLUICtrlFactory::getDefaultParams<LLLayoutPanel>();
-		panel_p.auto_resize = false;
-		panel_p.user_resize = false;
-		panel_p.rect = LLRect(0, 30, 25, 0);
-		LLLayoutPanel* close_panel = LLUICtrlFactory::create<LLLayoutPanel>(panel_p);
-		stackp->addChild(close_panel);
-
-		LLButton::Params button_p;
-		button_p.name = "close_notification";
-		button_p.rect = LLRect(5, 23, 21, 7);
-		button_p.image_color.control="DkGray_66";
-		button_p.image_unselected.name="Icon_Close_Foreground";
-		button_p.image_selected.name="Icon_Close_Press";
-		button_p.click_callback.function = boost::bind(&LLWindowShade::onCloseNotification, this);
-
-		close_panel->addChild(LLUICtrlFactory::create<LLButton>(button_p));
+		getChildRef<LLLayoutPanel>("background_area").setBackgroundVisible(false);
+		setMouseOpaque(false);
 	}
+}
+
+void LLWindowShade::hide()
+{
+	getChildRef<LLLayoutPanel>("notification_area").setVisible(false);
+}
+
+void LLWindowShade::onCloseNotification()
+{
+	if (!mNotifications.empty())
+		LLNotifications::instance().cancel(mNotifications.back());
+}
+
+void LLWindowShade::onClickIgnore(LLUICtrl* ctrl)
+{
+	LLNotificationPtr notify = getCurrentNotification();
+	if (!notify) return;
+
+	bool check = ctrl->getValue().asBoolean();
+	if (notify->getForm()->getIgnoreType() == LLNotificationForm::IGNORE_SHOW_AGAIN)
+	{
+		// question was "show again" so invert value to get "ignore"
+		check = !check;
+	}
+	notify->setIgnored(check);
+}
+
+void LLWindowShade::onClickNotificationButton(const std::string& name)
+{
+	LLNotificationPtr notify = getCurrentNotification();
+	if (!notify) return;
 
-	LLSD payload = mNotification->getPayload();
+	mNotificationResponse[name] = true;
+
+	notify->respond(mNotificationResponse);
+}
 
-	LLNotificationFormPtr formp = mNotification->getForm();
+void LLWindowShade::onEnterNotificationText(LLUICtrl* ctrl, const std::string& name)
+{
+	mNotificationResponse[name] = ctrl->getValue().asString();
+}
+
+void LLWindowShade::show(LLNotificationPtr notification)
+{
+	mNotifications.push_back(notification);
+
+	displayLatestNotification();
+}
+
+void LLWindowShade::displayLatestNotification()
+{
+	if (mNotifications.empty()) return;
+
+	LLNotificationPtr notification = mNotifications.back();
+
+	LLSD payload = notification->getPayload();
+
+	LLNotificationFormPtr formp = notification->getForm();
 	LLLayoutPanel& notification_area = getChildRef<LLLayoutPanel>("notification_area");
-	notification_area.getChild<LLUICtrl>("notification_icon")->setValue(mNotification->getIcon());
-	notification_area.getChild<LLUICtrl>("notification_text")->setValue(mNotification->getMessage());
-	notification_area.getChild<LLUICtrl>("notification_text")->setToolTip(mNotification->getMessage());
+	notification_area.getChild<LLUICtrl>("notification_icon")->setValue(notification->getIcon());
+	notification_area.getChild<LLUICtrl>("notification_text")->setValue(notification->getMessage());
+	notification_area.getChild<LLUICtrl>("notification_text")->setToolTip(notification->getMessage());
 
 	LLNotificationForm::EIgnoreType ignore_type = formp->getIgnoreType(); 
 	LLLayoutPanel& form_elements = notification_area.getChildRef<LLLayoutPanel>("form_elements");
 	form_elements.deleteAllChildren();
+	form_elements.reshape(form_elements.getRect().getWidth(), MIN_NOTIFICATION_AREA_HEIGHT);
 
 	const S32 FORM_PADDING_HORIZONTAL = 10;
 	const S32 FORM_PADDING_VERTICAL = 3;
@@ -229,7 +322,7 @@ void LLWindowShade::initFromParams(const LLWindowShade::Params& params)
 			label_p.v_pad = 5;
 			LLTextBox* textbox = LLUICtrlFactory::create<LLTextBox>(label_p);
 			textbox->reshapeToFitText();
-			textbox->reshape(textbox->getRect().getWidth(), form_elements.getRect().getHeight() - 2 * FORM_PADDING_VERTICAL); 
+			textbox->reshape(textbox->getRect().getWidth(), MIN_NOTIFICATION_AREA_HEIGHT - 2 * FORM_PADDING_VERTICAL); 
 			form_elements.addChild(textbox);
 			cur_x = textbox->getRect().mRight + FORM_PADDING_HORIZONTAL;
 
@@ -249,7 +342,7 @@ void LLWindowShade::initFromParams(const LLWindowShade::Params& params)
 		}
 	}
 
-	mFormHeight = form_elements.getRect().getHeight() - (cur_y - FORM_PADDING_VERTICAL) + WIDGET_HEIGHT;
+	mFormHeight = form_elements.getRect().getHeight() - (cur_y - WIDGET_HEIGHT - FORM_PADDING_VERTICAL);
 	form_elements.reshape(form_width, mFormHeight);
 	form_elements.setMinDim(form_width);
 
@@ -261,68 +354,39 @@ void LLWindowShade::initFromParams(const LLWindowShade::Params& params)
 	{
 		(*it)->translate(0, delta_y);
 	}
-}
 
-void LLWindowShade::show()
-{
 	getChildRef<LLLayoutPanel>("notification_area").setVisible(true);
 	getChildRef<LLLayoutPanel>("background_area").setBackgroundVisible(mModal);
 
 	setMouseOpaque(mModal);
 }
 
-void LLWindowShade::draw()
+void LLWindowShade::setBackgroundImage(LLUIImage* image)
 {
-	LLRect message_rect = getChild<LLTextBox>("notification_text")->getTextBoundingRect();
-
-	LLLayoutPanel* notification_area = getChild<LLLayoutPanel>("notification_area");
-
-	notification_area->reshape(notification_area->getRect().getWidth(), 
-		llclamp(message_rect.getHeight() + 10, 
-				llmin(mFormHeight, MAX_NOTIFICATION_AREA_HEIGHT),
-				MAX_NOTIFICATION_AREA_HEIGHT));
-
-	LLUICtrl::draw();
-	if (mNotification && !mNotification->isActive())
-	{
-		hide();
-	}
+	getChild<LLLayoutPanel>("notification_area")->setTransparentImage(image);
 }
 
-void LLWindowShade::hide()
+void LLWindowShade::setTextColor(LLColor4 color)
 {
-	getChildRef<LLLayoutPanel>("notification_area").setVisible(false);
-	getChildRef<LLLayoutPanel>("background_area").setBackgroundVisible(false);
-
-	setMouseOpaque(false);
+	getChild<LLTextBox>("notification_text")->setColor(color);
 }
 
-void LLWindowShade::onCloseNotification()
+bool LLWindowShade::isShown() const
 {
-	LLNotifications::instance().cancel(mNotification);
+	return getChildRef<LLLayoutPanel>("notification_area").getVisible();
 }
 
-void LLWindowShade::onClickIgnore(LLUICtrl* ctrl)
+void LLWindowShade::setCanClose(bool can_close)
 {
-	bool check = ctrl->getValue().asBoolean();
-	if (mNotification && mNotification->getForm()->getIgnoreType() == LLNotificationForm::IGNORE_SHOW_AGAIN)
-	{
-		// question was "show again" so invert value to get "ignore"
-		check = !check;
-	}
-	mNotification->setIgnored(check);
+	getChildView("close_panel")->setVisible(can_close);
 }
 
-void LLWindowShade::onClickNotificationButton(const std::string& name)
+LLNotificationPtr LLWindowShade::getCurrentNotification()
 {
-	if (!mNotification) return;
-
-	mNotificationResponse[name] = true;
-
-	mNotification->respond(mNotificationResponse);
+	if (mNotifications.empty())
+	{
+		return LLNotificationPtr();
+	}
+	return mNotifications.back();
 }
 
-void LLWindowShade::onEnterNotificationText(LLUICtrl* ctrl, const std::string& name)
-{
-	mNotificationResponse[name] = ctrl->getValue().asString();
-}
diff --git a/indra/llui/llwindowshade.h b/indra/llui/llwindowshade.h
index 09ffc2cd54..6d753d1161 100644
--- a/indra/llui/llwindowshade.h
+++ b/indra/llui/llwindowshade.h
@@ -36,20 +36,28 @@ class LLWindowShade : public LLUICtrl
 public:
 	struct Params : public LLInitParam::Block<Params, LLUICtrl::Params>
 	{
-		Mandatory<LLNotificationPtr>	notification;
 		Optional<LLUIImage*>			bg_image;
-		Optional<LLUIColor>				text_color;
+		Optional<LLUIColor>				text_color,
+										shade_color;
 		Optional<bool>					modal,
 										can_close;
 
 		Params();
 	};
 
-	void show();
+	void show(LLNotificationPtr);
 	/*virtual*/ void draw();
 	void hide();
+	
+	bool isShown() const;
+
+	void setBackgroundImage(LLUIImage* image);
+	void setTextColor(LLColor4 color);
+	void setCanClose(bool can_close);
 
 private:
+	void displayLatestNotification();
+	LLNotificationPtr getCurrentNotification();
 	friend class LLUICtrlFactory;
 
 	LLWindowShade(const Params& p);
@@ -60,7 +68,7 @@ private:
 	void onEnterNotificationText(LLUICtrl* ctrl, const std::string& name);
 	void onClickIgnore(LLUICtrl* ctrl);
 
-	LLNotificationPtr	mNotification;
+	std::vector<LLNotificationPtr>	mNotifications;
 	LLSD				mNotificationResponse;
 	bool				mModal;
 	S32					mFormHeight;
diff --git a/indra/llui/tests/llurlentry_stub.cpp b/indra/llui/tests/llurlentry_stub.cpp
index 4f251db93b..c75df86891 100644
--- a/indra/llui/tests/llurlentry_stub.cpp
+++ b/indra/llui/tests/llurlentry_stub.cpp
@@ -105,8 +105,6 @@ LLStyle::Params::Params()
 
 namespace LLInitParam
 {
-	BaseBlock::BaseBlock() {}
-	BaseBlock::~BaseBlock() {}
 	Param::Param(BaseBlock* enclosing_block)
 	:	mIsProvided(false)
 	{
@@ -114,7 +112,6 @@ namespace LLInitParam
 		const U8* block_addr = reinterpret_cast<const U8*>(enclosing_block);
 		mEnclosingBlockOffset = (U16)(my_addr - block_addr);
 	}
-	void BaseBlock::paramChanged(const Param& last_param, bool user_provided) {}
 
 	void BaseBlock::addParam(BlockDescriptor& block_data, const ParamDescriptorPtr in_param, const char* char_name){}
 	void BaseBlock::addSynonym(Param& param, const std::string& synonym) {}
diff --git a/indra/llui/tests/llurlmatch_test.cpp b/indra/llui/tests/llurlmatch_test.cpp
index 627f3129e9..7183413463 100644
--- a/indra/llui/tests/llurlmatch_test.cpp
+++ b/indra/llui/tests/llurlmatch_test.cpp
@@ -63,9 +63,6 @@ S32 LLUIImage::getHeight() const
 
 namespace LLInitParam
 {
-	BaseBlock::BaseBlock() {}
-	BaseBlock::~BaseBlock() {}
-
 	BlockDescriptor::BlockDescriptor() {}
 	ParamDescriptor::ParamDescriptor(param_handle_t p, 
 						merge_func_t merge_func, 
@@ -77,8 +74,6 @@ namespace LLInitParam
 						S32 max_count){}
 	ParamDescriptor::~ParamDescriptor() {}
 
-	void BaseBlock::paramChanged(const Param& last_param, bool user_provided) {}
-
 	void BaseBlock::addParam(BlockDescriptor& block_data, const ParamDescriptorPtr in_param, const char* char_name){}
 	param_handle_t BaseBlock::getHandleFromParam(const Param* param) const {return 0;}
 	void BaseBlock::addSynonym(Param& param, const std::string& synonym) {}