Consider text alignment and direction when computing the left offset for horizontal writing modes.

Source/core/rendering/RenderText.cpp

 /*
  * (C) 1999 Lars Knoll (knoll@kde.org)
  * (C) 2000 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007 Apple Inc. All rights reserved.
  * Copyright (C) 2006 Andrew Wellington (proton@wiretapped.net)
  * Copyright (C) 2006 Graham Dennis (graham.dennis@gmail.com)
  *
  * 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
@@ skipping 674 matching lines @@
 
     RenderBlock* cb = containingBlock();
     RenderStyle* cbStyle = cb->style();
 
     float leftEdge;
     float rightEdge;
     leftEdge = min<float>(0, rootLeft);
     rightEdge = max<float>(cb->logicalWidth(), rootRight);
 
     bool rightAligned = false;
-    switch (cbStyle->textAlign()) {
+    switch (simplifiedTextAlign(cbStyle->textAlign())) {
     case RIGHT:
-    case WEBKIT_RIGHT:
         rightAligned = true;
         break;
     case LEFT:
-    case WEBKIT_LEFT:
     case CENTER:
-    case WEBKIT_CENTER:
         break;
     case JUSTIFY:
-    case TASTART:
         rightAligned = !cbStyle->isLeftToRightDirection();
         break;
-    case TAEND:
-        rightAligned = cbStyle->isLeftToRightDirection();
+    default:
+        ASSERT_NOT_REACHED();
         break;
     }
 
     if (rightAligned) {
         left = max(left, leftEdge);
         left = min(left, rootRight - caretWidth);
     } else {
         left = min(left, rightEdge - caretWidthRightOfOffset);
         left = max(left, rootLeft);
     }
@@ skipping 1140 matching lines @@
     }
     secureTextTimer->restartWithNewText(lastTypedCharacterOffset);
 }
 
 PassRefPtr<AbstractInlineTextBox> RenderText::firstAbstractInlineTextBox()
 {
     return AbstractInlineTextBox::getOrCreate(this, m_firstTextBox);
 }
 
 } // namespace WebCore