Don't force full invalidation on box-sizing change

Source/core/rendering/style/RenderStyle.cpp

 /*
  * Copyright (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2011 Adobe Systems Incorporated. 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 406 matching lines @@
 }
 
 bool RenderStyle::diffNeedsFullLayoutAndRepaint(const RenderStyle& other) const
 {
     // FIXME: Not all cases in this method need both full layout and repaint.
     // Should move cases into diffNeedsFullLayout() if
     // - don't need repaint at all;
     // - or the renderer knows how to exactly repaint caused by the layout change
     //   instead of forced full repaint.
 
-    if (m_box.get() != other.m_box.get()) {
-        if (m_box->boxSizing() != other.m_box->boxSizing())
-            return true;
-    }
-
     if (surround.get() != other.surround.get()) {
         if (surround->margin != other.surround->margin)
             return true;
 
         if (surround->padding != other.surround->padding)
             return true;
 
         // If our border widths change, then we need to layout. Other changes to borders only necessitate a repaint.
         if (borderLeftWidth() != other.borderLeftWidth()
             || borderTopWidth() != other.borderTopWidth()
@@ skipping 166 matching lines @@
         if (m_box->width() != other.m_box->width()
             || m_box->minWidth() != other.m_box->minWidth()
             || m_box->maxWidth() != other.m_box->maxWidth()
             || m_box->height() != other.m_box->height()
             || m_box->minHeight() != other.m_box->minHeight()
             || m_box->maxHeight() != other.m_box->maxHeight())
             return true;
 
         if (m_box->verticalAlign() != other.m_box->verticalAlign())
             return true;
+
+        if (m_box->boxSizing() != other.m_box->boxSizing())
+            return true;
     }
 
     if (noninherited_flags._vertical_align != other.noninherited_flags._vertical_align)
         return true;
 
     return false;
 }
 
 bool RenderStyle::diffNeedsRepaintLayer(const RenderStyle& other) const
 {
@@ skipping 1083 matching lines @@
     // right
     radiiSum = radii.topRight().height() + radii.bottomRight().height();
     if (radiiSum > rect.height())
         factor = std::min(rect.height() / radiiSum, factor);
 
     ASSERT(factor <= 1);
     return factor;
 }
 
 } // namespace WebCore