Fix the adjustment to include overflow of negative spacing

Source/core/layout/LayoutBlockFlowLine.cpp

 /*
  * Copyright (C) 2000 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2003, 2004, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All right reserved.
  * Copyright (C) 2010 Google Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
@@ skipping 417 matching lines @@
         }
     }
 
     // Don't put this into 'else' part of the above 'if' because canUseSimpleFontCodePath may be modified in the 'if' block.
     if (!canUseSimpleFontCodePath)
         measuredWidth = layoutText->width(run->m_start, run->m_stop - run->m_start, xPos, run->direction(), lineInfo.isFirstLine(), &fallbackFonts, &glyphBounds);
 
     // Negative word-spacing and/or letter-spacing may cause some glyphs to overflow the left boundary and result
     // negative measured width. Reset measured width to 0 and adjust glyph bounds accordingly to cover the overflow.
     if (measuredWidth < 0) {
-        glyphBounds.move(measuredWidth, 0);
+        if (measuredWidth < glyphBounds.x()) {
+            glyphBounds.expand(glyphBounds.x() - measuredWidth, 0);
+            glyphBounds.setX(measuredWidth);
+        }
         measuredWidth = 0;
     }
 
     glyphOverflow.setFromBounds(glyphBounds, font.fontMetrics().floatAscent(), font.fontMetrics().floatDescent(), measuredWidth);
 
     run->m_box->setLogicalWidth(measuredWidth + hyphenWidth);
     if (!fallbackFonts.isEmpty()) {
         ASSERT(run->m_box->isText());
         GlyphOverflowAndFallbackFontsMap::ValueType* it = textBoxDataMap.add(toInlineTextBox(run->m_box), std::make_pair(Vector<const SimpleFontData*>(), GlyphOverflow())).storedValue;
         ASSERT(it->value.first.isEmpty());
@@ skipping 1616 matching lines @@
     LayoutUnit logicalLeft = logicalLeftOffsetForLine(logicalHeight(), false);
     LayoutUnit availableLogicalWidth = logicalRightOffsetForLine(logicalHeight(), false) - logicalLeft;
     updateLogicalWidthForAlignment(textAlign, 0, 0, logicalLeft, totalLogicalWidth, availableLogicalWidth, 0);
 
     if (!style()->isLeftToRightDirection())
         return logicalWidth() - logicalLeft;
     return logicalLeft;
 }
 
 }