Merge branch 'master' into DRTVWR-516-maint

# Conflicts:
#	indra/newview/app_settings/settings.xml
#	indra/newview/llvoicevivox.cpp

21 files changed, 377 insertions, 11 deletions

diff --git a/indra/llui/CMakeLists.txt b/indra/llui/CMakeLists.txt
index cce618487b..f781ff4110 100644
--- a/indra/llui/CMakeLists.txt
+++ b/indra/llui/CMakeLists.txt
@@ -122,6 +122,7 @@ set(llui_SOURCE_FILES
     lluictrl.cpp
     lluictrlfactory.cpp
     lluistring.cpp
+    lluiusage.cpp
     llundo.cpp
     llurlaction.cpp
     llurlentry.cpp
@@ -241,6 +242,7 @@ set(llui_HEADER_FILES
     llui.h
     lluicolor.h
     lluistring.h
+    lluiusage.h
     llundo.h
     llurlaction.h
     llurlentry.h
diff --git a/indra/llui/llbutton.cpp b/indra/llui/llbutton.cpp
index 9682c3bc10..0e59fdf519 100644
--- a/indra/llui/llbutton.cpp
+++ b/indra/llui/llbutton.cpp
@@ -47,6 +47,7 @@
 #include "llnotificationsutil.h"
 #include "llrender.h"
 #include "lluictrlfactory.h"
+#include "lluiusage.h"
 #include "llhelp.h"
 #include "lldockablefloater.h"
 #include "llviewereventrecorder.h"
@@ -437,6 +438,13 @@ BOOL LLButton::handleMouseDown(S32 x, S32 y, MASK mask)
 			setFocus(TRUE);
 		}
 
+		if (!mFunctionName.empty())
+		{
+			LL_DEBUGS("UIUsage") << "calling mouse down function " << mFunctionName << LL_ENDL;
+			LLUIUsage::instance().logCommand(mFunctionName);
+			LLUIUsage::instance().logControl(getPathname());
+		}
+
 		/*
 		 * ATTENTION! This call fires another mouse down callback.
 		 * If you wish to remove this call emit that signal directly
diff --git a/indra/llui/llchat.h b/indra/llui/llchat.h
index f5b242fdfc..c39e44200c 100644
--- a/indra/llui/llchat.h
+++ b/indra/llui/llchat.h
@@ -37,7 +37,8 @@ typedef enum e_chat_source_type
 	CHAT_SOURCE_SYSTEM = 0,
 	CHAT_SOURCE_AGENT = 1,
 	CHAT_SOURCE_OBJECT = 2,
-	CHAT_SOURCE_UNKNOWN = 3
+	CHAT_SOURCE_TELEPORT = 3,
+	CHAT_SOURCE_UNKNOWN = 4
 } EChatSourceType;
 
 typedef enum e_chat_type
@@ -64,7 +65,8 @@ typedef enum e_chat_style
 {
 	CHAT_STYLE_NORMAL,
 	CHAT_STYLE_IRC,
-	CHAT_STYLE_HISTORY
+	CHAT_STYLE_HISTORY,
+	CHAT_STYLE_TELEPORT_SEP
 }EChatStyle;
 
 // A piece of chat
diff --git a/indra/llui/llfloater.cpp b/indra/llui/llfloater.cpp
index cebb521189..0e42922543 100644
--- a/indra/llui/llfloater.cpp
+++ b/indra/llui/llfloater.cpp
@@ -58,6 +58,7 @@
 #include "llhelp.h"
 #include "llmultifloater.h"
 #include "llsdutil.h"
+#include "lluiusage.h"
 #include <boost/foreach.hpp>
 
 
@@ -198,7 +199,9 @@ LLFloater::Params::Params()
 	help_pressed_image("help_pressed_image"),
 	open_callback("open_callback"),
 	close_callback("close_callback"),
-	follows("follows")
+	follows("follows"),
+	rel_x("rel_x", 0),
+	rel_y("rel_y", 0)
 {
 	changeDefault(visible, false);
 }
@@ -267,6 +270,8 @@ LLFloater::LLFloater(const LLSD& key, const LLFloater::Params& p)
 	mHasBeenDraggedWhileMinimized(FALSE),
 	mPreviousMinimizedBottom(0),
 	mPreviousMinimizedLeft(0),
+	mDefaultRelativeX(p.rel_x),
+	mDefaultRelativeY(p.rel_y),
 	mMinimizeSignal(NULL)
 //	mNotificationContext(NULL)
 {
@@ -507,7 +512,12 @@ void LLFloater::destroy()
 // virtual
 LLFloater::~LLFloater()
 {
-	LLFloaterReg::removeInstance(mInstanceName, mKey);
+    if (!isDead())
+    {
+        // If it's dead, instance is supposed to be already removed, and
+        // in case of single instance we can remove new one by accident
+        LLFloaterReg::removeInstance(mInstanceName, mKey);
+    }
 	
 	if( gFocusMgr.childHasKeyboardFocus(this))
 	{
@@ -936,6 +946,15 @@ bool LLFloater::applyRectControl()
 
 			saved_rect = true;
 		}
+		else if ((mDefaultRelativeX != 0) && (mDefaultRelativeY != 0))
+		{
+			mPosition.mX = mDefaultRelativeX;
+			mPosition.mY = mDefaultRelativeY;
+			mPositioning = LLFloaterEnums::POSITIONING_RELATIVE;
+			applyRelativePosition();
+
+			saved_rect = true;
+		}
 
 		// remember updated position
 		if (rect_specified)
@@ -1633,6 +1652,7 @@ void LLFloater::bringToFront( S32 x, S32 y )
 // virtual
 void LLFloater::setVisibleAndFrontmost(BOOL take_focus,const LLSD& key)
 {
+	LLUIUsage::instance().logFloater(getInstanceName());
 	LLMultiFloater* hostp = getHost();
 	if (hostp)
 	{
@@ -3200,6 +3220,9 @@ void LLFloater::initFromParams(const LLFloater::Params& p)
 	mSingleInstance = p.single_instance;
 	mReuseInstance = p.reuse_instance.isProvided() ? p.reuse_instance : p.single_instance;
 
+	mDefaultRelativeX = p.rel_x;
+	mDefaultRelativeY = p.rel_y;
+
 	mPositioning = p.positioning;
 
 	mSaveRect = p.save_rect;
diff --git a/indra/llui/llfloater.h b/indra/llui/llfloater.h
index f8c04e8a2f..2672d600c6 100644
--- a/indra/llui/llfloater.h
+++ b/indra/llui/llfloater.h
@@ -172,6 +172,9 @@ public:
 		Optional<S32>			header_height,
 								legacy_header_height; // HACK see initFromXML()
 
+		Optional<F32>			rel_x,
+								rel_y;
+
 		// Images for top-right controls
 		Optional<LLUIImage*>	close_image,
 								restore_image,
@@ -521,6 +524,9 @@ private:
 	BOOL			mHasBeenDraggedWhileMinimized;
 	S32				mPreviousMinimizedBottom;
 	S32				mPreviousMinimizedLeft;
+
+	F32				mDefaultRelativeX;
+	F32				mDefaultRelativeY;
 };
 
 
diff --git a/indra/llui/llfloaterreg.cpp b/indra/llui/llfloaterreg.cpp
index 85e07fc6a6..36a0cb0fd0 100644
--- a/indra/llui/llfloaterreg.cpp
+++ b/indra/llui/llfloaterreg.cpp
@@ -32,6 +32,7 @@
 #include "llfloater.h"
 #include "llmultifloater.h"
 #include "llfloaterreglistener.h"
+#include "lluiusage.h"
 
 //*******************************************************
 
@@ -57,6 +58,12 @@ void LLFloaterReg::add(const std::string& name, const std::string& filename, con
 }
 
 //static
+bool LLFloaterReg::isRegistered(const std::string& name)
+{
+    return sBuildMap.find(name) != sBuildMap.end();
+}
+
+//static
 LLFloater* LLFloaterReg::getLastFloaterInGroup(const std::string& name)
 {
 	const std::string& groupname = sGroupMap[name];
@@ -472,7 +479,6 @@ void LLFloaterReg::toggleInstanceOrBringToFront(const LLSD& sdname, const LLSD&
 	std::string name = sdname.asString();
 	LLFloater* instance = getInstance(name, key); 
 	
-
 	if (!instance)
 	{
 		LL_DEBUGS() << "Unable to get instance of floater '" << name << "'" << LL_ENDL;
diff --git a/indra/llui/llfloaterreg.h b/indra/llui/llfloaterreg.h
index e3b17dcb4f..a457a15673 100644
--- a/indra/llui/llfloaterreg.h
+++ b/indra/llui/llfloaterreg.h
@@ -85,6 +85,7 @@ public:
 	
 	static void add(const std::string& name, const std::string& file, const LLFloaterBuildFunc& func,
 					const std::string& groupname = LLStringUtil::null);
+	static bool isRegistered(const std::string& name);
 
 	// Helpers
 	static LLFloater* getLastFloaterInGroup(const std::string& name);
diff --git a/indra/llui/lllineeditor.h b/indra/llui/lllineeditor.h
index aa5779d45f..f84625bea7 100644
--- a/indra/llui/lllineeditor.h
+++ b/indra/llui/lllineeditor.h
@@ -283,6 +283,9 @@ public:
 
 	void			resetContextMenu() { setContextMenu(NULL); };
 
+	void			setBgImage(LLPointer<LLUIImage> image) { mBgImage = image; }
+	void			setBgImageFocused(LLPointer<LLUIImage> image) { mBgImageFocused = image; }
+
 private:
 	// private helper methods
 
diff --git a/indra/llui/llmenugl.cpp b/indra/llui/llmenugl.cpp
index 37dbe9b40e..cdaf03ebde 100644
--- a/indra/llui/llmenugl.cpp
+++ b/indra/llui/llmenugl.cpp
@@ -79,7 +79,7 @@ const U32 LEFT_PAD_PIXELS = 3;
 const U32 LEFT_WIDTH_PIXELS = 15;
 const U32 LEFT_PLAIN_PIXELS = LEFT_PAD_PIXELS + LEFT_WIDTH_PIXELS;
 
-const U32 RIGHT_PAD_PIXELS = 2;
+const U32 RIGHT_PAD_PIXELS = 7;
 const U32 RIGHT_WIDTH_PIXELS = 15;
 const U32 RIGHT_PLAIN_PIXELS = RIGHT_PAD_PIXELS + RIGHT_WIDTH_PIXELS;
 
@@ -95,7 +95,7 @@ const std::string SEPARATOR_NAME("separator");
 const std::string VERTICAL_SEPARATOR_LABEL( "|" );
 
 const std::string LLMenuGL::BOOLEAN_TRUE_PREFIX( "\xE2\x9C\x94" ); // U+2714 HEAVY CHECK MARK
-const std::string LLMenuGL::BRANCH_SUFFIX( "\xE2\x96\xB6" ); // U+25B6 BLACK RIGHT-POINTING TRIANGLE
+const std::string LLMenuGL::BRANCH_SUFFIX( "\xe2\x96\xb8" ); // U+25B6 BLACK RIGHT-POINTING TRIANGLE
 const std::string LLMenuGL::ARROW_UP  ("^^^^^^^");
 const std::string LLMenuGL::ARROW_DOWN("vvvvvvv");
 
diff --git a/indra/llui/llnotifications.cpp b/indra/llui/llnotifications.cpp
index 06ec648178..b791a19c2b 100644
--- a/indra/llui/llnotifications.cpp
+++ b/indra/llui/llnotifications.cpp
@@ -77,6 +77,7 @@ LLNotificationForm::FormButton::FormButton()
 	text("text"),
 	ignore("ignore"),
 	is_default("default"),
+	width("width", 0),
 	type("type")
 {
 	// set type here so it gets serialized
diff --git a/indra/llui/llnotifications.h b/indra/llui/llnotifications.h
index 39576ad86d..b1123d27e5 100644
--- a/indra/llui/llnotifications.h
+++ b/indra/llui/llnotifications.h
@@ -190,6 +190,7 @@ public:
 		Mandatory<std::string>	text;
 		Optional<std::string>	ignore;
 		Optional<bool>			is_default;
+		Optional<S32>			width;
 
 		Mandatory<std::string>	type;
 
diff --git a/indra/llui/llsearcheditor.cpp b/indra/llui/llsearcheditor.cpp
index 1fdd05a11c..bafeef41fb 100644
--- a/indra/llui/llsearcheditor.cpp
+++ b/indra/llui/llsearcheditor.cpp
@@ -34,7 +34,11 @@
 LLSearchEditor::LLSearchEditor(const LLSearchEditor::Params& p)
 :	LLUICtrl(p),
 	mSearchButton(NULL),
-	mClearButton(NULL)
+	mClearButton(NULL),
+	mEditorImage(p.background_image),
+	mEditorImageFocused(p.background_image_focused),
+	mEditorSearchImage(p.background_image_highlight),
+	mHighlightTextField(p.highlight_text_field)
 {
 	S32 srch_btn_top = p.search_button.top_pad + p.search_button.rect.height;
 	S32 srch_btn_right = p.search_button.rect.width + p.search_button.left_pad;
@@ -57,6 +61,8 @@ LLSearchEditor::LLSearchEditor(const LLSearchEditor::Params& p)
 	// Set up line editor.
 	LLLineEditor::Params line_editor_params(p);
 	line_editor_params.name("filter edit box");
+	line_editor_params.background_image(p.background_image);
+	line_editor_params.background_image_focused(p.background_image_focused);
 	line_editor_params.rect(getLocalRect());
 	line_editor_params.follows.flags(FOLLOWS_ALL);
 	line_editor_params.text_pad_left(text_pad_left);
@@ -104,6 +110,20 @@ void LLSearchEditor::draw()
 	if (mClearButton)
 		mClearButton->setVisible(!mSearchEditor->getWText().empty());
 
+	if (mHighlightTextField)
+	{	
+		if (!mSearchEditor->getWText().empty())
+		{
+			mSearchEditor->setBgImage(mEditorSearchImage);
+			mSearchEditor->setBgImageFocused(mEditorSearchImage);
+		}
+		else
+		{
+			mSearchEditor->setBgImage(mEditorImage);
+			mSearchEditor->setBgImageFocused(mEditorImageFocused);
+		}
+	}
+
 	LLUICtrl::draw();
 }
 
diff --git a/indra/llui/llsearcheditor.h b/indra/llui/llsearcheditor.h
index 3b12868225..c0f3c1d60c 100644
--- a/indra/llui/llsearcheditor.h
+++ b/indra/llui/llsearcheditor.h
@@ -47,14 +47,23 @@ public:
 		Optional<LLButton::Params>	search_button, 
 									clear_button;
 		Optional<bool>				search_button_visible, 
-									clear_button_visible;
+									clear_button_visible,
+									highlight_text_field;
 		Optional<commit_callback_t> keystroke_callback;
 
+		Optional<LLUIImage*>		background_image,
+									background_image_focused,
+									background_image_highlight;
+
 		Params()
 		:	search_button("search_button"),
 			search_button_visible("search_button_visible"),
 			clear_button("clear_button"), 
-			clear_button_visible("clear_button_visible")
+			clear_button_visible("clear_button_visible"),
+			highlight_text_field("highlight_text_field"),
+			background_image("background_image"),
+			background_image_focused("background_image_focused"),
+			background_image_highlight("background_image_highlight")
 		{}
 	};
 
@@ -93,6 +102,13 @@ protected:
 	LLLineEditor* mSearchEditor;
 	LLButton* mSearchButton;
 	LLButton* mClearButton;
+
+	LLPointer<LLUIImage> mEditorImage;
+	LLPointer<LLUIImage> mEditorImageFocused;
+	LLPointer<LLUIImage> mEditorSearchImage;
+	LLPointer<LLUIImage> mEditorSearchImageFocused;
+
+	bool mHighlightTextField;
 };
 
 #endif  // LL_SEARCHEDITOR_H
diff --git a/indra/llui/lltabcontainer.cpp b/indra/llui/lltabcontainer.cpp
index e6b43da8e5..459fdcf2ae 100644
--- a/indra/llui/lltabcontainer.cpp
+++ b/indra/llui/lltabcontainer.cpp
@@ -38,6 +38,7 @@
 #include "llrender.h"
 #include "llfloater.h"
 #include "lltrans.h"
+#include "lluiusage.h"
 
 //----------------------------------------------------------------------------
 
@@ -1556,6 +1557,8 @@ BOOL LLTabContainer::setTab(S32 which)
 			
 			if (is_selected)
 			{
+				LLUIUsage::instance().logPanel(tuple->mTabPanel->getName());
+
 				// Make sure selected tab is within scroll region
 				if (mIsVertical)
 				{
diff --git a/indra/llui/lltoolbar.cpp b/indra/llui/lltoolbar.cpp
index 0961db37ba..5150df25f2 100644
--- a/indra/llui/lltoolbar.cpp
+++ b/indra/llui/lltoolbar.cpp
@@ -967,6 +967,8 @@ LLToolBarButton* LLToolBar::createButton(const LLCommandId& id)
 			executeStopParam.function_name = executeStopFunction;
 			executeStopParam.parameter = commandp->executeStopParameters();
 			LLUICtrl::commit_callback_t execute_func = initCommitCallback(executeParam);
+			button->setFunctionName(commandp->executeFunctionName());
+			LL_DEBUGS("UIUsage") << "button function name a -> " << commandp->executeFunctionName() << LL_ENDL;
 			LLUICtrl::commit_callback_t stop_func = initCommitCallback(executeStopParam);
 			
 			button->setMouseDownCallback(boost::bind(&LLToolBarButton::callIfEnabled, button, execute_func, _1, _2));
@@ -974,6 +976,8 @@ LLToolBarButton* LLToolBar::createButton(const LLCommandId& id)
 		}
 		else
 		{
+			button->setFunctionName(commandp->executeFunctionName());
+			LL_DEBUGS("UIUsage") << "button function name b -> " << commandp->executeFunctionName() << LL_ENDL;
 			button->setCommitCallback(executeParam);
 		}
 
diff --git a/indra/llui/lluictrl.cpp b/indra/llui/lluictrl.cpp
index 544a76e8d5..5924542a19 100644
--- a/indra/llui/lluictrl.cpp
+++ b/indra/llui/lluictrl.cpp
@@ -35,6 +35,7 @@
 #include "lluictrlfactory.h"
 #include "lltabcontainer.h"
 #include "llaccordionctrltab.h"
+#include "lluiusage.h"
 
 static LLDefaultChildRegistry::Register<LLUICtrl> r("ui_ctrl");
 
@@ -282,6 +283,7 @@ LLUICtrl::commit_signal_t::slot_type LLUICtrl::initCommitCallback(const CommitCa
 	else
 	{
 		std::string function_name = cb.function_name;
+		setFunctionName(function_name);
 		commit_callback_t* func = (CommitCallbackRegistry::getValue(function_name));
 		if (func)
 		{
@@ -422,7 +424,19 @@ BOOL LLUICtrl::canFocusChildren() const
 void LLUICtrl::onCommit()
 {
 	if (mCommitSignal)
-	(*mCommitSignal)(this, getValue());
+	{
+		if (!mFunctionName.empty())
+		{
+			LL_DEBUGS("UIUsage") << "calling commit function " << mFunctionName << LL_ENDL;
+			LLUIUsage::instance().logCommand(mFunctionName);
+			LLUIUsage::instance().logControl(getPathname());
+		}
+		else
+		{
+			//LL_DEBUGS("UIUsage") << "calling commit function " << "UNKNOWN" << LL_ENDL;
+		}
+		(*mCommitSignal)(this, getValue());
+	}
 }
 
 //virtual
@@ -597,6 +611,12 @@ void LLUICtrl::setMakeInvisibleControlVariable(LLControlVariable* control)
 		setVisible(!(mMakeInvisibleControlVariable->getValue().asBoolean()));
 	}
 }
+
+void LLUICtrl::setFunctionName(const std::string& function_name)
+{
+	mFunctionName = function_name;
+}
+
 // static
 bool LLUICtrl::controlListener(const LLSD& newvalue, LLHandle<LLUICtrl> handle, std::string type)
 {
diff --git a/indra/llui/lluictrl.h b/indra/llui/lluictrl.h
index 7360bd7659..67dd24341c 100644
--- a/indra/llui/lluictrl.h
+++ b/indra/llui/lluictrl.h
@@ -183,6 +183,8 @@ public:
 	void setMakeVisibleControlVariable(LLControlVariable* control);
 	void setMakeInvisibleControlVariable(LLControlVariable* control);
 
+	void setFunctionName(const std::string& function_name);
+	
 	virtual void	setTentative(BOOL b);
 	virtual BOOL	getTentative() const;
 	virtual void	setValue(const LLSD& value);
@@ -310,6 +312,8 @@ protected:
 	LLControlVariable* mMakeInvisibleControlVariable;
 	boost::signals2::connection mMakeInvisibleControlConnection;
 
+	std::string mFunctionName;
+
 	static F32 sActiveControlTransparency;
 	static F32 sInactiveControlTransparency;
 	
diff --git a/indra/llui/lluiusage.cpp b/indra/llui/lluiusage.cpp
new file mode 100644
index 0000000000..ccae6643b9
--- /dev/null
+++ b/indra/llui/lluiusage.cpp
@@ -0,0 +1,146 @@
+/**
+* @file lluiuisage.cpp
+* @brief Source file for LLUIUsage
+*
+* $LicenseInfo:firstyear=2021&license=viewerlgpl$
+* Second Life Viewer Source Code
+* Copyright (C) 2021, Linden Research, Inc.
+*
+* This library is free software; you can redistribute it and/or
+* modify it under the terms of the GNU Lesser General Public
+* License as published by the Free Software Foundation;
+* version 2.1 of the License only.
+*
+* This library is distributed in the hope that it will be useful,
+* but WITHOUT ANY WARRANTY; without even the implied warranty of
+* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+* Lesser General Public License for more details.
+*
+* You should have received a copy of the GNU Lesser General Public
+* License along with this library; if not, write to the Free Software
+* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+*
+* Linden Research, Inc., 945 Battery Street, San Francisco, CA  94111  USA
+* $/LicenseInfo$
+*/
+
+#include "linden_common.h"
+#include "lluiusage.h"
+#include <boost/algorithm/string.hpp>
+
+LLUIUsage::LLUIUsage()
+{
+}
+
+LLUIUsage::~LLUIUsage()
+{
+}
+
+// static
+std::string LLUIUsage::sanitized(const std::string& s)
+{
+	// Remove characters that make the ViewerStats db unhappy
+	std::string result(s);
+	std::replace(result.begin(), result.end(), '.', '_');
+	std::replace(result.begin(), result.end(), ' ', '_');
+	return result;
+}
+
+// static
+void LLUIUsage::setLLSDPath(LLSD& sd, const std::string& path, S32 max_elts, const LLSD& val)
+{
+	// Keep the last max_elts components of the specified path
+	std::vector<std::string> fields;
+	boost::split(fields, path, boost::is_any_of("/"));
+	auto first_pos = std::max(fields.begin(), fields.end() - max_elts);
+	auto end_pos = fields.end();
+	std::vector<std::string> last_fields(first_pos,end_pos);
+
+	setLLSDNested(sd, last_fields, val);
+}
+
+// setLLSDNested()
+// Accomplish the equivalent of 
+//   sd[fields[0]][fields[1]]... = val;
+// for an arbitrary number of fields.
+// This might be useful as an LLSD utility function; is not specific to LLUIUsage
+// 
+// static
+void LLUIUsage::setLLSDNested(LLSD& sd, const std::vector<std::string>& fields, const LLSD& val)
+{
+	LLSD* fsd = &sd;
+	for (auto it=fields.begin(); it!=fields.end(); ++it)
+	{
+		if (it == fields.end()-1)
+		{
+			(*fsd)[*it] = val;
+		}
+		else
+		{
+			if (!(*fsd)[*it].isMap())
+			{
+				(*fsd)[*it] = LLSD::emptyMap();
+			}
+			fsd = &(*fsd)[*it];
+		}
+	}
+}
+
+void LLUIUsage::logCommand(const std::string& command)
+{
+	mCommandCounts[sanitized(command)]++;
+	LL_DEBUGS("UIUsage") << "command " << command << LL_ENDL;
+}
+
+void LLUIUsage::logControl(const std::string& control)
+{
+	mControlCounts[sanitized(control)]++;
+	LL_DEBUGS("UIUsage") << "control " << control << LL_ENDL;
+}
+
+
+void LLUIUsage::logFloater(const std::string& floater)
+{
+	mFloaterCounts[sanitized(floater)]++;
+	LL_DEBUGS("UIUsage") << "floater " << floater << LL_ENDL;
+}
+
+void LLUIUsage::logPanel(const std::string& p)
+{
+	mPanelCounts[sanitized(p)]++;
+	LL_DEBUGS("UIUsage") << "panel " << p << LL_ENDL;
+}
+
+LLSD LLUIUsage::asLLSD() const
+{
+	LLSD result;
+	for (auto const& it : mCommandCounts)
+	{
+		result["commands"][it.first] = LLSD::Integer(it.second);
+	}
+	for (auto const& it : mControlCounts)
+	{
+		setLLSDPath(result["controls"], it.first, 2, LLSD::Integer(it.second));
+	}
+	for (auto const& it : mFloaterCounts)
+	{
+		result["floaters"][it.first] = LLSD::Integer(it.second);
+	}
+	for (auto const& it : mPanelCounts)
+	{
+		result["panels"][it.first] = LLSD::Integer(it.second);
+	}
+	return result;
+}
+
+// Clear up some junk content generated during initial login/UI initialization
+void LLUIUsage::clear()
+{
+
+	LL_DEBUGS("UIUsage") << "clear" << LL_ENDL;
+	mCommandCounts.clear();
+	mControlCounts.clear();
+	mFloaterCounts.clear();
+	mPanelCounts.clear();
+}
+
diff --git a/indra/llui/lluiusage.h b/indra/llui/lluiusage.h
new file mode 100644
index 0000000000..a30cd80db3
--- /dev/null
+++ b/indra/llui/lluiusage.h
@@ -0,0 +1,57 @@
+/**
+* @file lluiuisage.h
+* @brief Header file for LLUIUsage
+*
+* $LicenseInfo:firstyear=2021&license=viewerlgpl$
+* Second Life Viewer Source Code
+* Copyright (C) 2021, Linden Research, Inc.
+*
+* This library is free software; you can redistribute it and/or
+* modify it under the terms of the GNU Lesser General Public
+* License as published by the Free Software Foundation;
+* version 2.1 of the License only.
+*
+* This library is distributed in the hope that it will be useful,
+* but WITHOUT ANY WARRANTY; without even the implied warranty of
+* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+* Lesser General Public License for more details.
+*
+* You should have received a copy of the GNU Lesser General Public
+* License along with this library; if not, write to the Free Software
+* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+*
+* Linden Research, Inc., 945 Battery Street, San Francisco, CA  94111  USA
+* $/LicenseInfo$
+*/
+
+#ifndef LL_LLUIUSAGE_H
+#define LL_LLUIUSAGE_H
+
+#include <map>
+#include "llsd.h"
+#include "llsingleton.h"
+
+// UIUsage tracking to see which operations and UI elements are most popular in a session
+class LLUIUsage : public LLSingleton<LLUIUsage>
+{
+public:
+	LLSINGLETON(LLUIUsage);
+	~LLUIUsage();
+public:
+	static std::string sanitized(const std::string& s);
+	static void setLLSDPath(LLSD& sd, const std::string& path, S32 max_elts, const LLSD& val);
+	static void setLLSDNested(LLSD& sd, const std::vector<std::string>& fields, const LLSD& val);
+	void logCommand(const std::string& command);
+	void logControl(const std::string& control);
+	void logFloater(const std::string& floater);
+	void logPanel(const std::string& p);
+	LLSD asLLSD() const;
+	void clear();
+private:
+	std::map<std::string,U32> mCommandCounts;
+	std::map<std::string,U32> mControlCounts;
+	std::map<std::string,U32> mFloaterCounts;
+	std::map<std::string,U32> mPanelCounts;
+};
+
+#endif // LLUIUIUSAGE.h
diff --git a/indra/llui/llvirtualtrackball.cpp b/indra/llui/llvirtualtrackball.cpp
index 723643dd25..6e0aef740d 100644
--- a/indra/llui/llvirtualtrackball.cpp
+++ b/indra/llui/llvirtualtrackball.cpp
@@ -348,6 +348,42 @@ LLQuaternion LLVirtualTrackball::getRotation() const
 	return mValue;
 }
 
+// static
+void LLVirtualTrackball::getAzimuthAndElevation(const LLQuaternion &quat, F32 &azimuth, F32 &elevation)
+{
+    // LLQuaternion has own function to get azimuth, but it doesn't appear to return correct values (meant for 2d?)
+    LLVector3 point = VectorZero * quat;
+
+    if (!is_approx_zero(point.mV[VX]) || !is_approx_zero(point.mV[VY]))
+    {
+        azimuth = atan2f(point.mV[VX], point.mV[VY]);
+    }
+    else
+    {
+        azimuth = 0;
+    }
+
+    azimuth -= F_PI_BY_TWO;
+
+    if (azimuth < 0)
+    {
+        azimuth += F_PI * 2;
+    }
+
+    // while vector is '1', F32 is not sufficiently precise and we can get
+    // values like 1.0000012 which will result in -90deg angle instead of 90deg
+    F32 z = llclamp(point.mV[VZ], -1.f, 1.f);
+    elevation = asin(z); // because VectorZero's length is '1'
+}
+
+// static
+void LLVirtualTrackball::getAzimuthAndElevationDeg(const LLQuaternion &quat, F32 &azimuth, F32 &elevation)
+{
+    getAzimuthAndElevation(quat, azimuth, elevation);
+    azimuth *= RAD_TO_DEG;
+    elevation *= RAD_TO_DEG;
+}
+
 BOOL LLVirtualTrackball::handleHover(S32 x, S32 y, MASK mask)
 {
     if (hasMouseCapture())
@@ -409,6 +445,10 @@ BOOL LLVirtualTrackball::handleHover(S32 x, S32 y, MASK mask)
             mValue *= az_quat;
         }
 
+        // we are doing a lot of F32 mathematical operations with loss of precision,
+        // re-normalize to compensate
+        mValue.normalize();
+
         mPrevX = x;
         mPrevY = y;
         onCommit();
diff --git a/indra/llui/llvirtualtrackball.h b/indra/llui/llvirtualtrackball.h
index 2d4b1ece17..c7a893877b 100644
--- a/indra/llui/llvirtualtrackball.h
+++ b/indra/llui/llvirtualtrackball.h
@@ -96,6 +96,9 @@ public:
     void            setRotation(const LLQuaternion &value);
     LLQuaternion    getRotation() const;
 
+    static void             getAzimuthAndElevation(const LLQuaternion &quat, F32 &azimuth, F32 &elevation);
+    static void             getAzimuthAndElevationDeg(const LLQuaternion &quat, F32 &azimuth, F32 &elevation);
+
 protected:
     friend class LLUICtrlFactory;
     LLVirtualTrackball(const Params&);