Correction to layoutOverflowRect in case of direction:rtl

Source/core/rendering/RenderLayerScrollableArea.cpp

 /*
  * Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011, 2012 Apple Inc. All rights reserved.
  *
  * Portions are Copyright (C) 1998 Netscape Communications Corporation.
  *
  * Other contributors:
  *   Robert O'Callahan <roc+@cs.cmu.edu>
  *   David Baron <dbaron@fas.harvard.edu>
  *   Christian Biesinger <cbiesinger@web.de>
  *   Randall Jesup <rjesup@wgate.com>
@@ skipping 413 matching lines @@
 
 void RenderLayerScrollableArea::computeScrollDimensions()
 {
     RenderBox* box = toRenderBox(renderer());
 
     m_scrollDimensionsDirty = false;
 
     m_overflowRect = box->layoutOverflowRect();
     box->flipForWritingMode(m_overflowRect);
 
-    int scrollableLeftOverflow = m_overflowRect.x() - box->borderLeft();
+    int scrollableLeftOverflow = m_overflowRect.x() - box->borderLeft() - (box->style()->shouldPlaceBlockDirectionScrollbarOnLogicalLeft() ? box->verticalScrollbarWidth() : 0);
     int scrollableTopOverflow = m_overflowRect.y() - box->borderTop();
     setScrollOrigin(IntPoint(-scrollableLeftOverflow, -scrollableTopOverflow));
 }
 
 void RenderLayerScrollableArea::scrollToOffset(const IntSize& scrollOffset, ScrollOffsetClamping clamp)
 {
     IntSize newScrollOffset = clamp == ScrollOffsetClamped ? clampScrollOffset(scrollOffset) : scrollOffset;
     if (newScrollOffset != adjustedScrollOffset())
         scrollToOffsetWithoutAnimation(-scrollOrigin() + newScrollOffset);
 }
@@ skipping 473 matching lines @@
             return true;
         }
     }
 
     // FIXME: We should hit test the m_scrollCorner and pass it back through the result.
 
     return false;
 }
 
 } // Namespace WebCore