Recompute overflow after transform changes

Source/core/rendering/RenderBlock.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2007 David Smith (catfish.man@gmail.com)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) Research In Motion Limited 2010. 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
@@ skipping 1498 matching lines @@
     } else {
         ColumnInfo* colInfo = columnInfo();
         if (columnCount(colInfo)) {
             LayoutRect lastRect = columnRectAt(colInfo, columnCount(colInfo) - 1);
             addLayoutOverflow(lastRect);
             addContentsVisualOverflow(lastRect);
         }
     }
 }
 
+void RenderBlock::updateOverflowForTransform()
+{
+    LayoutUnit oldClientAfterEdge = hasRenderOverflow() ? m_overflow->layoutClientAfterEdge() : clientLogicalBottom();
+    computeOverflow(oldClientAfterEdge, true);
+    if (hasOverflowClip())
+        layer()->scrollableArea()->updateAfterOverflowRecalc();
+}
+
 void RenderBlock::computeOverflow(LayoutUnit oldClientAfterEdge, bool)
 {
     m_overflow.clear();
 
     // Add overflow from children.
     addOverflowFromChildren();
 
     // Add in the overflow from positioned objects.
     addOverflowFromPositionedObjects();
 
@@ skipping 3492 matching lines @@
 void RenderBlock::showLineTreeAndMark(const InlineBox* markedBox1, const char* markedLabel1, const InlineBox* markedBox2, const char* markedLabel2, const RenderObject* obj) const
 {
     showRenderObject();
     for (const RootInlineBox* root = firstRootBox(); root; root = root->nextRootBox())
         root->showLineTreeAndMark(markedBox1, markedLabel1, markedBox2, markedLabel2, obj, 1);
 }
 
 #endif
 
 } // namespace WebCore