Merge from default branch.

Resolved conflicts in llalertdialog.h and llnotify.cpp (local deletion vs
remote change) by removing them.

--HG--
branch : product-engine

11 files changed, 175 insertions, 113 deletions

diff --git a/indra/llui/llbutton.cpp b/indra/llui/llbutton.cpp
index 7721137e29..e9f6288f44 100644
--- a/indra/llui/llbutton.cpp
+++ b/indra/llui/llbutton.cpp
@@ -63,7 +63,6 @@ template class LLButton* LLView::getChild<class LLButton>(
 
 // globals loaded from settings.xml
 S32	LLBUTTON_H_PAD	= 0;
-S32	LLBUTTON_V_PAD	= 0;
 S32 BTN_HEIGHT_SMALL= 0;
 S32 BTN_HEIGHT		= 0;
 
@@ -93,6 +92,7 @@ LLButton::Params::Params()
 	flash_color("flash_color"),
 	pad_right("pad_right", LLUI::sSettingGroups["config"]->getS32("ButtonHPad")),
 	pad_left("pad_left", LLUI::sSettingGroups["config"]->getS32("ButtonHPad")),
+	pad_bottom("pad_bottom"),
 	click_callback("click_callback"),
 	mouse_down_callback("mouse_down_callback"),
 	mouse_up_callback("mouse_up_callback"),
@@ -148,6 +148,7 @@ LLButton::LLButton(const LLButton::Params& p)
 	mHAlign(p.font_halign),
 	mLeftHPad(p.pad_left),
 	mRightHPad(p.pad_right),
+	mBottomVPad(p.pad_bottom),
 	mHoverGlowStrength(p.hover_glow_amount),
 	mCommitOnReturn(p.commit_on_return),
 	mFadeWhenDisabled(FALSE),
@@ -839,7 +840,9 @@ void LLButton::draw()
 		// LLFontGL::render expects S32 max_chars variable but process in a separate way -1 value.
 		// Due to U32_MAX is equal to S32 -1 value I have rest this value for non-ellipses mode.
 		// 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)(LLBUTTON_V_PAD + y_offset),
+		mLastDrawCharsCount = mGLFont->render(label, 0,
+			(F32)x,
+			(F32)(mBottomVPad + y_offset),
 			label_color % alpha,
 			mHAlign, LLFontGL::BOTTOM,
 			LLFontGL::NORMAL,
diff --git a/indra/llui/llbutton.h b/indra/llui/llbutton.h
index 4c7400220d..5e28b8cdff 100644
--- a/indra/llui/llbutton.h
+++ b/indra/llui/llbutton.h
@@ -49,7 +49,6 @@
 // PLEASE please use these "constants" when building your own buttons.
 // They are loaded from settings.xml at run time.
 extern S32	LLBUTTON_H_PAD;
-extern S32	LLBUTTON_V_PAD;
 extern S32	BTN_HEIGHT_SMALL;
 extern S32	BTN_HEIGHT;
 
@@ -105,6 +104,7 @@ public:
 		// layout
 		Optional<S32>			pad_right;
 		Optional<S32>			pad_left;
+		Optional<S32>			pad_bottom; // under text label
 		
 		// callbacks
 		Optional<CommitCallbackParam>	click_callback, // alias -> commit_callback
@@ -310,6 +310,7 @@ private:
 	LLFontGL::HAlign			mHAlign;
 	S32							mLeftHPad;
 	S32							mRightHPad;
+	S32							mBottomVPad;	// under text label
 
 	F32							mHoverGlowStrength;
 	F32							mCurGlowStrength;
diff --git a/indra/llui/lldraghandle.cpp b/indra/llui/lldraghandle.cpp
index d9b98b1c28..a93c666648 100644
--- a/indra/llui/lldraghandle.cpp
+++ b/indra/llui/lldraghandle.cpp
@@ -112,6 +112,7 @@ void LLDragHandleTop::setTitle(const std::string& title)
 		params.font(font);
 		params.follows.flags(FOLLOWS_TOP | FOLLOWS_LEFT | FOLLOWS_RIGHT);
 		params.font_shadow(LLFontGL::DROP_SHADOW_SOFT);
+		params.use_ellipses = true;
 		mTitleBox = LLUICtrlFactory::create<LLTextBox> (params);
 		addChild( mTitleBox );
 	}
diff --git a/indra/llui/llfloater.cpp b/indra/llui/llfloater.cpp
index fd7b64af02..5fd707fea3 100644
--- a/indra/llui/llfloater.cpp
+++ b/indra/llui/llfloater.cpp
@@ -1649,6 +1649,7 @@ void LLFloater::draw()
 	}
 	else
 	{
+		//FIXME: get rid of this hack
 		// draw children
 		LLView* focused_child = dynamic_cast<LLView*>(gFocusMgr.getKeyboardFocus());
 		BOOL focused_child_visible = FALSE;
@@ -2703,6 +2704,18 @@ bool LLFloater::initFloaterXML(LLXMLNodePtr node, LLView *parent, LLXMLNodePtr o
 			output_node, output_params, &default_params);
 	}
 
+	// Default floater position to top-left corner of screen
+	// However, some legacy floaters have explicit top or bottom
+	// coordinates set, so respect their wishes.
+	if (!params.rect.top.isProvided() && !params.rect.bottom.isProvided())
+	{
+		params.rect.top.set(0);
+	}
+	if (!params.rect.left.isProvided() && !params.rect.right.isProvided())
+	{
+		params.rect.left.set(0);
+	}
+
 	setupParams(params, parent);
  	initFromParams(params);
 	
diff --git a/indra/llui/lltabcontainer.cpp b/indra/llui/lltabcontainer.cpp
index d7d61cf6cb..2d9106923e 100644
--- a/indra/llui/lltabcontainer.cpp
+++ b/indra/llui/lltabcontainer.cpp
@@ -906,7 +906,7 @@ void LLTabContainer::addTabPanel(const TabPanelParams& panel)
 	
 	if (placeholder)
 	{
-		btn_rect.translate(0, -LLBUTTON_V_PAD-2);
+		btn_rect.translate(0, -3); // *TODO: make configurable
 		LLTextBox::Params params;
 		params.name(trimmed_label);
 		params.rect(btn_rect);
diff --git a/indra/llui/lltextbase.cpp b/indra/llui/lltextbase.cpp
index e0503a0844..1f120a1483 100644
--- a/indra/llui/lltextbase.cpp
+++ b/indra/llui/lltextbase.cpp
@@ -312,7 +312,7 @@ void LLTextBase::drawSelectionBackground()
 
 		S32 selection_left		= llmin( mSelectionStart, mSelectionEnd );
 		S32 selection_right		= llmax( mSelectionStart, mSelectionEnd );
-		LLRect selection_rect = mTextRect;
+		LLRect selection_rect = mVisibleTextRect;
 
 		// Skip through the lines we aren't drawing.
 		LLRect content_display_rect = getVisibleDocumentRect();
@@ -391,7 +391,7 @@ void LLTextBase::drawSelectionBackground()
 			++rect_it)
 		{
 			LLRect selection_rect = *rect_it;
-			selection_rect.translate(mTextRect.mLeft - content_display_rect.mLeft, mTextRect.mBottom - content_display_rect.mBottom);
+			selection_rect.translate(mVisibleTextRect.mLeft - content_display_rect.mLeft, mVisibleTextRect.mBottom - content_display_rect.mBottom);
 			gl_rect_2d(selection_rect, selection_color);
 		}
 	}
@@ -538,10 +538,10 @@ void LLTextBase::drawText()
 			line_end = next_start;
 		}
 
-		LLRect text_rect(line.mRect.mLeft + mTextRect.mLeft - scrolled_view_rect.mLeft,
-						line.mRect.mTop - scrolled_view_rect.mBottom + mTextRect.mBottom,
+		LLRect text_rect(line.mRect.mLeft + mVisibleTextRect.mLeft - scrolled_view_rect.mLeft,
+						line.mRect.mTop - scrolled_view_rect.mBottom + mVisibleTextRect.mBottom,
 						llmin(mDocumentView->getRect().getWidth(), line.mRect.mRight) - scrolled_view_rect.mLeft,
-						line.mRect.mBottom - scrolled_view_rect.mBottom + mTextRect.mBottom);
+						line.mRect.mBottom - scrolled_view_rect.mBottom + mVisibleTextRect.mBottom);
 
 		// draw a single line of text
 		S32 seg_start = line_start;
@@ -561,14 +561,14 @@ void LLTextBase::drawText()
 			
 			S32 clipped_end	=	llmin( line_end, cur_segment->getEnd() )  - cur_segment->getStart();
 
-			if (mUseEllipses
-				&& clipped_end == line_end 
-				&& next_line == last_line 
-				&& last_line < (S32)mLineInfoList.size())
+			if (mUseEllipses								// using ellipses
+				&& clipped_end == line_end					// last segment on line
+				&& next_line == last_line					// this is the last visible line
+				&& last_line < (S32)mLineInfoList.size())	// and there is more text to display
 			{
-				// more text to go, but we can't fit it
-				// so attempt to draw one extra character to force ellipses
-				clipped_end++;
+				// more lines of text to go, but we can't fit them
+				// so shrink text rect to force ellipses
+				text_rect.mRight -= 2;
 			}
 
 			text_rect.mLeft = (S32)(cur_segment->draw(seg_start - cur_segment->getStart(), clipped_end, selection_left, selection_right, text_rect));
@@ -949,7 +949,7 @@ void LLTextBase::reshape(S32 width, S32 height, BOOL called_from_parent)
 		LLUICtrl::reshape( width, height, called_from_parent );
 
 		// do this first after reshape, because other things depend on
-		// up-to-date mTextRect
+		// up-to-date mVisibleTextRect
 		updateRects();
 		
 		needsReflow();
@@ -984,7 +984,7 @@ void LLTextBase::draw()
 							: hasFocus() 
 								? mFocusBgColor.get() 
 								: mWriteableBgColor.get();
-		gl_rect_2d(mTextRect, bg_color, TRUE);
+		gl_rect_2d(mVisibleTextRect, bg_color, TRUE);
 	}
 
 	// draw document view
@@ -1053,9 +1053,9 @@ S32 LLTextBase::getLeftOffset(S32 width)
 	case LLFontGL::LEFT:
 		return mHPad;
 	case LLFontGL::HCENTER:
-		return mHPad + (mTextRect.getWidth() - width - mHPad) / 2;
+		return mHPad + (mVisibleTextRect.getWidth() - width - mHPad) / 2;
 	case LLFontGL::RIGHT:
-		return mTextRect.getWidth() - width;
+		return mVisibleTextRect.getWidth() - width;
 	default:
 		return mHPad;
 	}
@@ -1071,17 +1071,17 @@ void LLTextBase::reflow(S32 start_index)
 
 	while(mReflowNeeded)
 	{
-		mReflowNeeded = FALSE;
+		mReflowNeeded = false;
 
 		// shrink document to minimum size (visible portion of text widget)
 		// to force inlined widgets with follows set to shrink
-		mDocumentView->setShape(mTextRect);
+		mDocumentView->reshape(mVisibleTextRect.getWidth(), mDocumentView->getRect().getHeight());
 
 		bool scrolled_to_bottom = mScroller ? mScroller->isAtBottom() : false;
 
 		LLRect old_cursor_rect = getLocalRectFromDocIndex(mCursorPos);
-		bool follow_selection = mTextRect.overlaps(old_cursor_rect); // cursor is visible
-		old_cursor_rect.translate(-mTextRect.mLeft, -mTextRect.mBottom);
+		bool follow_selection = mVisibleTextRect.overlaps(old_cursor_rect); // cursor is visible
+		old_cursor_rect.translate(-mVisibleTextRect.mLeft, -mVisibleTextRect.mBottom);
 
 		S32 first_line = getFirstVisibleLine();
 
@@ -1094,15 +1094,15 @@ void LLTextBase::reflow(S32 start_index)
 		}
 		LLRect first_char_rect = getLocalRectFromDocIndex(mScrollIndex);
 		// subtract off effect of horizontal scrollbar from local position of first char
-		first_char_rect.translate(-mTextRect.mLeft, -mTextRect.mBottom);
+		first_char_rect.translate(-mVisibleTextRect.mLeft, -mVisibleTextRect.mBottom);
 
 		S32 cur_top = 0;
 
 		segment_set_t::iterator seg_iter = mSegments.begin();
 		S32 seg_offset = 0;
 		S32 line_start_index = 0;
-		const S32 text_width = mTextRect.getWidth() - mHPad;  // reserve room for margin
-		S32 remaining_pixels = text_width;
+		const S32 text_available_width = mVisibleTextRect.getWidth() - mHPad;  // reserve room for margin
+		S32 remaining_pixels = text_available_width;
 		LLWString text(getWText());
 		S32 line_count = 0;
 
@@ -1142,10 +1142,11 @@ void LLTextBase::reflow(S32 start_index)
 
 			S32 last_segment_char_on_line = segment->getStart() + seg_offset;
 
-			S32 text_left = getLeftOffset(text_width - remaining_pixels);
+			S32 text_actual_width = text_available_width - remaining_pixels;
+			S32 text_left = getLeftOffset(text_actual_width);
 			LLRect line_rect(text_left, 
 							cur_top, 
-							text_left + (text_width - remaining_pixels), 
+							text_left + text_actual_width, 
 							cur_top - line_height);
 
 			// if we didn't finish the current segment...
@@ -1160,7 +1161,7 @@ void LLTextBase::reflow(S32 start_index)
 
 				line_start_index = segment->getStart() + seg_offset;
 				cur_top -= llround((F32)line_height * mLineSpacingMult) + mLineSpacingPixels;
-				remaining_pixels = text_width;
+				remaining_pixels = text_available_width;
 				line_height = 0;
 			}
 			// ...just consumed last segment..
@@ -1188,7 +1189,7 @@ void LLTextBase::reflow(S32 start_index)
 					line_start_index = segment->getStart() + seg_offset;
 					cur_top -= llround((F32)line_height * mLineSpacingMult) + mLineSpacingPixels;
 					line_height = 0;
-					remaining_pixels = text_width;
+					remaining_pixels = text_available_width;
 				}
 				++seg_iter;
 				seg_offset = 0;
@@ -1238,10 +1239,10 @@ void LLTextBase::reflow(S32 start_index)
 	}
 }
 
-LLRect LLTextBase::getContentsRect()
+LLRect LLTextBase::getTextBoundingRect()
 {
 	reflow();
-	return mContentsRect;
+	return mTextBoundingRect;
 }
 
 
@@ -1760,7 +1761,7 @@ S32 LLTextBase::getDocIndexFromLocalCoord( S32 local_x, S32 local_y, BOOL round
 	LLRect visible_region = getVisibleDocumentRect();
 
 	// binary search for line that starts before local_y
-	line_list_t::const_iterator line_iter = std::lower_bound(mLineInfoList.begin(), mLineInfoList.end(), local_y - mTextRect.mBottom + visible_region.mBottom, compare_bottom());
+	line_list_t::const_iterator line_iter = std::lower_bound(mLineInfoList.begin(), mLineInfoList.end(), local_y - mVisibleTextRect.mBottom + visible_region.mBottom, compare_bottom());
 
 	if (line_iter == mLineInfoList.end())
 	{
@@ -1768,7 +1769,7 @@ S32 LLTextBase::getDocIndexFromLocalCoord( S32 local_x, S32 local_y, BOOL round
 	}
 	
 	S32 pos = getLength();
-	S32 start_x = mTextRect.mLeft + line_iter->mRect.mLeft;
+	S32 start_x = mVisibleTextRect.mLeft + line_iter->mRect.mLeft;
 
 	segment_set_t::iterator line_seg_iter;
 	S32 line_seg_offset;
@@ -1879,7 +1880,7 @@ LLRect LLTextBase::getLocalRectFromDocIndex(S32 pos) const
 	if (mLineInfoList.empty()) 
 	{ 
 		// return default height rect in upper left
-		local_rect = mTextRect;
+		local_rect = mVisibleTextRect;
 		local_rect.mBottom = local_rect.mTop - (S32)(mDefaultFont->getLineHeight());
 		return local_rect;
 	}
@@ -1890,8 +1891,8 @@ LLRect LLTextBase::getLocalRectFromDocIndex(S32 pos) const
 	// compensate for scrolled, inset view of doc
 	LLRect scrolled_view_rect = getVisibleDocumentRect();
 	local_rect = doc_rect;
-	local_rect.translate(mTextRect.mLeft - scrolled_view_rect.mLeft, 
-						mTextRect.mBottom - scrolled_view_rect.mBottom);
+	local_rect.translate(mVisibleTextRect.mLeft - scrolled_view_rect.mLeft, 
+						mVisibleTextRect.mBottom - scrolled_view_rect.mBottom);
 
 	return local_rect;
 }
@@ -1991,7 +1992,7 @@ void LLTextBase::changeLine( S32 delta )
 
 	LLRect visible_region = getVisibleDocumentRect();
 
-	S32 new_cursor_pos = getDocIndexFromLocalCoord(mDesiredXPixel, mLineInfoList[new_line].mRect.mBottom + mTextRect.mBottom - visible_region.mBottom, TRUE);
+	S32 new_cursor_pos = getDocIndexFromLocalCoord(mDesiredXPixel, mLineInfoList[new_line].mRect.mBottom + mVisibleTextRect.mBottom - visible_region.mBottom, TRUE);
 	setCursorPos(new_cursor_pos, true);
 }
 
@@ -2067,56 +2068,64 @@ void LLTextBase::updateRects()
 {
 	if (mLineInfoList.empty()) 
 	{
-		mContentsRect = LLRect(0, mVPad, mHPad, 0);
+		mTextBoundingRect = LLRect(0, mVPad, mHPad, 0);
 	}
 	else
 	{
-		mContentsRect = mLineInfoList.begin()->mRect;
+		mTextBoundingRect = mLineInfoList.begin()->mRect;
 		for (line_list_t::const_iterator line_iter = ++mLineInfoList.begin();
 			line_iter != mLineInfoList.end();
 			++line_iter)
 		{
-			mContentsRect.unionWith(line_iter->mRect);
+			mTextBoundingRect.unionWith(line_iter->mRect);
 		}
 
-		mContentsRect.mTop += mVPad;
+		mTextBoundingRect.mTop += mVPad;
 		// subtract a pixel off the bottom to deal with rounding errors in measuring font height
-		mContentsRect.mBottom -= 1;
+		mTextBoundingRect.mBottom -= 1;
 
-		S32 delta_pos = -mContentsRect.mBottom;
+		S32 delta_pos = -mTextBoundingRect.mBottom;
 		// move line segments to fit new document rect
 		for (line_list_t::iterator it = mLineInfoList.begin(); it != mLineInfoList.end(); ++it)
 		{
 			it->mRect.translate(0, delta_pos);
 		}
-		mContentsRect.translate(0, delta_pos);
+		mTextBoundingRect.translate(0, delta_pos);
 	}
 
 	// update document container dimensions according to text contents
-	LLRect doc_rect = mContentsRect;
-	// use old mTextRect constraint document to width of viewable region
+	LLRect doc_rect = mTextBoundingRect;
+	// use old mVisibleTextRect constraint document to width of viewable region
 	doc_rect.mLeft = 0;
-	doc_rect.mRight = llmax(mTextRect.getWidth(), mContentsRect.mRight);
+
+	// allow horizontal scrolling?
+	// if so, use entire width of text contents
+	// otherwise, stop at width of mVisibleTextRect
+	doc_rect.mRight = mScroller 
+		? llmax(mVisibleTextRect.getWidth(), mTextBoundingRect.mRight)
+		: mVisibleTextRect.getWidth();
 
 	mDocumentView->setShape(doc_rect);
 
-	//update mTextRect *after* mDocumentView has been resized
+	//update mVisibleTextRect *after* mDocumentView has been resized
 	// so that scrollbars are added if document needs to scroll
-	// since mTextRect does not include scrollbars
-	LLRect old_text_rect = mTextRect;
-	mTextRect = mScroller ? mScroller->getContentWindowRect() : getLocalRect();
+	// since mVisibleTextRect does not include scrollbars
+	LLRect old_text_rect = mVisibleTextRect;
+	mVisibleTextRect = mScroller ? mScroller->getContentWindowRect() : getLocalRect();
 	//FIXME: replace border with image?
 	if (mBorderVisible)
 	{
-		mTextRect.stretch(-1);
+		mVisibleTextRect.stretch(-1);
 	}
-	if (mTextRect != old_text_rect)
+	if (mVisibleTextRect != old_text_rect)
 	{
 		needsReflow();
 	}
 
-	// update document container again, using new mTextRect
-	doc_rect.mRight = llmax(mTextRect.getWidth(), mContentsRect.mRight);
+	// update document container again, using new mVisibleTextRect (that has scrollbars enabled as needed)
+	doc_rect.mRight = mScroller 
+		? llmax(mVisibleTextRect.getWidth(), mTextBoundingRect.mRight)
+		: mVisibleTextRect.getWidth();
 	mDocumentView->setShape(doc_rect);
 }
 
@@ -2154,7 +2163,7 @@ LLRect LLTextBase::getVisibleDocumentRect() const
 		LLRect doc_rect = mDocumentView->getLocalRect();
 		doc_rect.mLeft -= mDocumentView->getRect().mLeft;
 		// adjust for height of text above widget baseline
-		doc_rect.mBottom = doc_rect.getHeight() - mTextRect.getHeight();
+		doc_rect.mBottom = doc_rect.getHeight() - mVisibleTextRect.getHeight();
 		return doc_rect;
 	}
 }
@@ -2413,10 +2422,18 @@ bool LLNormalTextSegment::getDimensions(S32 first_char, S32 num_chars, S32& widt
 	if (num_chars > 0)
 	{
 		LLWString text = mEditor.getWText();
-		width = mStyle->getFont()->getWidth(text.c_str(), mStart + first_char, num_chars);
 		// if last character is a newline, then return true, forcing line break
 		llwchar last_char = text[mStart + first_char + num_chars - 1];
-		force_newline = (last_char == '\n');
+		if (last_char == '\n')
+		{
+			force_newline = true;
+			// don't count newline in font width
+			width = mStyle->getFont()->getWidth(text.c_str(), mStart + first_char, num_chars - 1);
+		}
+		else
+		{
+			width = mStyle->getFont()->getWidth(text.c_str(), mStart + first_char, num_chars);
+		}
 	}
 	else
 	{
diff --git a/indra/llui/lltextbase.h b/indra/llui/lltextbase.h
index 0138ca3704..a1f8ba39ae 100644
--- a/indra/llui/lltextbase.h
+++ b/indra/llui/lltextbase.h
@@ -156,8 +156,8 @@ public:
 	void					addDocumentChild(LLView* view);
 	void					removeDocumentChild(LLView* view);
 	const LLView*			getDocumentView() const { return mDocumentView; }
-	LLRect					getTextRect() { return mTextRect; }
-	LLRect					getContentsRect();
+	LLRect					getVisibleTextRect() { return mVisibleTextRect; }
+	LLRect					getTextBoundingRect();
 	LLRect					getVisibleDocumentRect() const;
 
 	S32						getVPad() { return mVPad; }
@@ -311,8 +311,8 @@ protected:
 	// text segmentation and flow
 	segment_set_t       		mSegments;
 	line_list_t					mLineInfoList;
-	LLRect						mTextRect;			// The rect in which text is drawn.  Excludes borders.
-	LLRect						mContentsRect;
+	LLRect						mVisibleTextRect;			// The rect in which text is drawn.  Excludes borders.
+	LLRect						mTextBoundingRect;
 
 	// colors
 	LLUIColor					mCursorColor;
diff --git a/indra/llui/lltextbox.cpp b/indra/llui/lltextbox.cpp
index 0bd0ab59fb..a1f5b5726b 100644
--- a/indra/llui/lltextbox.cpp
+++ b/indra/llui/lltextbox.cpp
@@ -134,12 +134,12 @@ void LLTextBox::setClickedCallback( boost::function<void (void*)> cb, void* user
 
 S32 LLTextBox::getTextPixelWidth()
 {
-	return getContentsRect().getWidth();
+	return getTextBoundingRect().getWidth();
 }
 
 S32 LLTextBox::getTextPixelHeight()
 {
-	return getContentsRect().getHeight();
+	return getTextBoundingRect().getHeight();
 }
 
 
diff --git a/indra/llui/lltexteditor.cpp b/indra/llui/lltexteditor.cpp
index faf9ccbeb8..e8fc9475a5 100644
--- a/indra/llui/lltexteditor.cpp
+++ b/indra/llui/lltexteditor.cpp
@@ -758,8 +758,8 @@ BOOL LLTextEditor::handleHover(S32 x, S32 y, MASK mask)
 			{	
 				mScroller->autoScroll(x, y);
 			}
-			S32 clamped_x = llclamp(x, mTextRect.mLeft, mTextRect.mRight);
-			S32 clamped_y = llclamp(y, mTextRect.mBottom, mTextRect.mTop);
+			S32 clamped_x = llclamp(x, mVisibleTextRect.mLeft, mVisibleTextRect.mRight);
+			S32 clamped_y = llclamp(y, mVisibleTextRect.mBottom, mVisibleTextRect.mTop);
 			setCursorAtLocalPos( clamped_x, clamped_y, true );
 			mSelectionEnd = mCursorPos;
 		}
@@ -809,8 +809,8 @@ BOOL LLTextEditor::handleMouseUp(S32 x, S32 y, MASK mask)
 			{
 				mScroller->autoScroll(x, y);
 			}
-			S32 clamped_x = llclamp(x, mTextRect.mLeft, mTextRect.mRight);
-			S32 clamped_y = llclamp(y, mTextRect.mBottom, mTextRect.mTop);
+			S32 clamped_x = llclamp(x, mVisibleTextRect.mLeft, mVisibleTextRect.mRight);
+			S32 clamped_y = llclamp(y, mVisibleTextRect.mBottom, mVisibleTextRect.mTop);
 			setCursorAtLocalPos( clamped_x, clamped_y, true );
 			endSelection();
 		}
@@ -2075,8 +2075,8 @@ void LLTextEditor::drawPreeditMarker()
 	const S32 line_height = llround( mDefaultFont->getLineHeight() );
 
 	S32 line_start = getLineStart(cur_line);
-	S32 line_y = mTextRect.mTop - line_height;
-	while((mTextRect.mBottom <= line_y) && (num_lines > cur_line))
+	S32 line_y = mVisibleTextRect.mTop - line_height;
+	while((mVisibleTextRect.mBottom <= line_y) && (num_lines > cur_line))
 	{
 		S32 next_start = -1;
 		S32 line_end = text_len;
@@ -2108,12 +2108,12 @@ void LLTextEditor::drawPreeditMarker()
 					continue;
 				}
 
-				S32 preedit_left = mTextRect.mLeft;
+				S32 preedit_left = mVisibleTextRect.mLeft;
 				if (left > line_start)
 				{
 					preedit_left += mDefaultFont->getWidth(text, line_start, left - line_start);
 				}
-				S32 preedit_right = mTextRect.mLeft;
+				S32 preedit_right = mVisibleTextRect.mLeft;
 				if (right < line_end)
 				{
 					preedit_right += mDefaultFont->getWidth(text, line_start, right - line_start);
@@ -2154,7 +2154,7 @@ void LLTextEditor::drawLineNumbers()
 {
 	LLGLSUIDefault gls_ui;
 	LLRect scrolled_view_rect = getVisibleDocumentRect();
-	LLRect content_rect = getTextRect();	
+	LLRect content_rect = getVisibleTextRect();	
 	LLLocalClipRect clip(content_rect);
 	S32 first_line = getFirstVisibleLine();
 	S32 num_lines = getLineCount();
@@ -2180,12 +2180,12 @@ void LLTextEditor::drawLineNumbers()
 		{
 			line_info& line = mLineInfoList[cur_line];
 
-			if ((line.mRect.mTop - scrolled_view_rect.mBottom) < mTextRect.mBottom) 
+			if ((line.mRect.mTop - scrolled_view_rect.mBottom) < mVisibleTextRect.mBottom) 
 			{
 				break;
 			}
 
-			S32 line_bottom = line.mRect.mBottom - scrolled_view_rect.mBottom + mTextRect.mBottom;
+			S32 line_bottom = line.mRect.mBottom - scrolled_view_rect.mBottom + mVisibleTextRect.mBottom;
 			// draw the line numbers
 			if(line.mLineNum != last_line_num && line.mRect.mTop <= scrolled_view_rect.mTop) 
 			{
@@ -2216,8 +2216,8 @@ void LLTextEditor::draw()
 {
 	{
 		// pad clipping rectangle so that cursor can draw at full width
-		// when at left edge of mTextRect
-		LLRect clip_rect(mTextRect);
+		// when at left edge of mVisibleTextRect
+		LLRect clip_rect(mVisibleTextRect);
 		clip_rect.stretch(1);
 		LLLocalClipRect clip(clip_rect);
 		drawPreeditMarker();
@@ -2781,7 +2781,7 @@ BOOL LLTextEditor::getPreeditLocation(S32 query_offset, LLCoordGL *coord, LLRect
 	if (control)
 	{
 		LLRect control_rect_screen;
-		localRectToScreen(mTextRect, &control_rect_screen);
+		localRectToScreen(mVisibleTextRect, &control_rect_screen);
 		LLUI::screenRectToGL(control_rect_screen, control);
 	}
 
@@ -2832,8 +2832,8 @@ BOOL LLTextEditor::getPreeditLocation(S32 query_offset, LLCoordGL *coord, LLRect
 
 	if (coord)
 	{
-		const S32 query_x = mTextRect.mLeft + mDefaultFont->getWidth(text, current_line_start, query - current_line_start);
-		const S32 query_y = mTextRect.mTop - (current_line - first_visible_line) * line_height - line_height / 2;
+		const S32 query_x = mVisibleTextRect.mLeft + mDefaultFont->getWidth(text, current_line_start, query - current_line_start);
+		const S32 query_y = mVisibleTextRect.mTop - (current_line - first_visible_line) * line_height - line_height / 2;
 		S32 query_screen_x, query_screen_y;
 		localPointToScreen(query_x, query_y, &query_screen_x, &query_screen_y);
 		LLUI::screenPointToGL(query_screen_x, query_screen_y, &coord->mX, &coord->mY);
@@ -2841,13 +2841,13 @@ BOOL LLTextEditor::getPreeditLocation(S32 query_offset, LLCoordGL *coord, LLRect
 
 	if (bounds)
 	{
-		S32 preedit_left = mTextRect.mLeft;
+		S32 preedit_left = mVisibleTextRect.mLeft;
 		if (preedit_left_position > current_line_start)
 		{
 			preedit_left += mDefaultFont->getWidth(text, current_line_start, preedit_left_position - current_line_start);
 		}
 
-		S32 preedit_right = mTextRect.mLeft;
+		S32 preedit_right = mVisibleTextRect.mLeft;
 		if (preedit_right_position < current_line_end)
 		{
 			preedit_right += mDefaultFont->getWidth(text, current_line_start, preedit_right_position - current_line_start);
@@ -2857,7 +2857,7 @@ BOOL LLTextEditor::getPreeditLocation(S32 query_offset, LLCoordGL *coord, LLRect
 			preedit_right += mDefaultFont->getWidth(text, current_line_start, current_line_end - current_line_start);
 		}
 
-		const S32 preedit_top = mTextRect.mTop - (current_line - first_visible_line) * line_height;
+		const S32 preedit_top = mVisibleTextRect.mTop - (current_line - first_visible_line) * line_height;
 		const S32 preedit_bottom = preedit_top - line_height;
 
 		const LLRect preedit_rect_local(preedit_left, preedit_top, preedit_right, preedit_bottom);
diff --git a/indra/llui/lluistring.cpp b/indra/llui/lluistring.cpp
index 3a1e656364..f7a53e87de 100644
--- a/indra/llui/lluistring.cpp
+++ b/indra/llui/lluistring.cpp
@@ -39,22 +39,23 @@ LLFastTimer::DeclareTimer FTM_UI_STRING("UI String");
 
 
 LLUIString::LLUIString(const std::string& instring, const LLStringUtil::format_map_t& args)
-	: mOrig(instring),
-	  mArgs(args)
+:	mOrig(instring),
+	mArgs(args)
 {
-	format();
+	dirty();
 }
 
 void LLUIString::assign(const std::string& s)
 {
 	mOrig = s;
-	format();
+	dirty();
 }
 
 void LLUIString::setArgList(const LLStringUtil::format_map_t& args)
+
 {
 	mArgs = args;
-	format();
+	dirty();
 }
 
 void LLUIString::setArgs(const LLSD& sd)
@@ -68,40 +69,40 @@ void LLUIString::setArgs(const LLSD& sd)
 	{
 		setArg(sd_it->first, sd_it->second.asString());
 	}
-	format();
+	dirty();
 }
 
 void LLUIString::setArg(const std::string& key, const std::string& replacement)
 {
 	mArgs[key] = replacement;
-	format();
+	dirty();
 }
 
 void LLUIString::truncate(S32 maxchars)
 {
-	if (mWResult.size() > (size_t)maxchars)
+	if (getUpdatedWResult().size() > (size_t)maxchars)
 	{
-		LLWStringUtil::truncate(mWResult, maxchars);
-		mResult = wstring_to_utf8str(mWResult);
+		LLWStringUtil::truncate(getUpdatedWResult(), maxchars);
+		mResult = wstring_to_utf8str(getUpdatedWResult());
 	}
 }
 
 void LLUIString::erase(S32 charidx, S32 len)
 {
-	mWResult.erase(charidx, len);
-	mResult = wstring_to_utf8str(mWResult);
+	getUpdatedWResult().erase(charidx, len);
+	mResult = wstring_to_utf8str(getUpdatedWResult());
 }
 
 void LLUIString::insert(S32 charidx, const LLWString& wchars)
 {
-	mWResult.insert(charidx, wchars);
-	mResult = wstring_to_utf8str(mWResult);
+	getUpdatedWResult().insert(charidx, wchars);
+	mResult = wstring_to_utf8str(getUpdatedWResult());
 }
 
 void LLUIString::replace(S32 charidx, llwchar wc)
 {
-	mWResult[charidx] = wc;
-	mResult = wstring_to_utf8str(mWResult);
+	getUpdatedWResult()[charidx] = wc;
+	mResult = wstring_to_utf8str(getUpdatedWResult());
 }
 
 void LLUIString::clear()
@@ -112,8 +113,16 @@ void LLUIString::clear()
 	mWResult.clear();
 }
 
-void LLUIString::format()
+void LLUIString::dirty()
 {
+	mNeedsResult = true;
+	mNeedsWResult = true;
+}
+
+void LLUIString::updateResult() const
+{
+	mNeedsResult = false;
+
 	LLFastTimer timer(FTM_UI_STRING);
 	
 	// optimize for empty strings (don't attempt string replacement)
@@ -129,5 +138,11 @@ void LLUIString::format()
 	LLStringUtil::format_map_t combined_args = LLTrans::getDefaultArgs();
 	combined_args.insert(mArgs.begin(), mArgs.end());
 	LLStringUtil::format(mResult, combined_args);
-	mWResult = utf8str_to_wstring(mResult);
+}
+
+void LLUIString::updateWResult() const
+{
+	mNeedsWResult = false;
+
+	mWResult = utf8str_to_wstring(getUpdatedResult());
 }
diff --git a/indra/llui/lluistring.h b/indra/llui/lluistring.h
index 763de4d6a3..7ec0fd603a 100644
--- a/indra/llui/lluistring.h
+++ b/indra/llui/lluistring.h
@@ -76,19 +76,19 @@ public:
 	void setArgs(const class LLSD& sd);
 	void setArg(const std::string& key, const std::string& replacement);
 
-	const std::string& getString() const { return mResult; }
-	operator std::string() const { return mResult; }
+	const std::string& getString() const { return getUpdatedResult(); }
+	operator std::string() const { return getUpdatedResult(); }
 
-	const LLWString& getWString() const { return mWResult; }
-	operator LLWString() const { return mWResult; }
+	const LLWString& getWString() const { return getUpdatedWResult(); }
+	operator LLWString() const { return getUpdatedWResult(); }
 
-	bool empty() const { return mWResult.empty(); }
-	S32 length() const { return mWResult.size(); }
+	bool empty() const { return getUpdatedResult().empty(); }
+	S32 length() const { return getUpdatedWResult().size(); }
 
 	void clear();
 	void clearArgs() { mArgs.clear(); }
 	
-	// These utuilty functions are included for text editing.
+	// These utility functions are included for text editing.
 	// They do not affect mOrig and do not perform argument substitution
 	void truncate(S32 maxchars);
 	void erase(S32 charidx, S32 len);
@@ -96,12 +96,24 @@ public:
 	void replace(S32 charidx, llwchar wc);
 	
 private:
-	void format();	
+	// something changed, requiring reformatting of strings
+	void dirty();
+
+	std::string& getUpdatedResult() const { if (mNeedsResult) { updateResult(); } return mResult; }
+	LLWString& getUpdatedWResult() const{ if (mNeedsWResult) { updateWResult(); } return mWResult; }
+
+	// do actual work of updating strings (non-inlined)
+	void updateResult() const;
+	void updateWResult() const;
 	
 	std::string mOrig;
-	std::string mResult;
-	LLWString mWResult; // for displaying
+	mutable std::string mResult;
+	mutable LLWString mWResult; // for displaying
 	LLStringUtil::format_map_t mArgs;
+
+	// controls lazy evaluation
+	mutable bool	mNeedsResult;
+	mutable bool	mNeedsWResult;
 };
 
 #endif // LL_LLUISTRING_H