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 496 matching lines @@
     return snapSizeToPixel(m_overflowRect.height(), m_box->clientTop() + m_box->y());
 }
 
 void RenderLayerScrollableArea::computeScrollDimensions()
 {
     m_scrollDimensionsDirty = false;
 
     m_overflowRect = m_box->layoutOverflowRect();
     m_box->flipForWritingMode(m_overflowRect);
 
-    int scrollableLeftOverflow = m_overflowRect.x() - m_box->borderLeft();
+    int scrollableLeftOverflow = m_overflowRect.x() - m_box->borderLeft() - (m_box->style()->shouldPlaceBlockDirectionScrollbarOnLogicalLeft() ? m_box->verticalScrollbarWidth() : 0);
     int scrollableTopOverflow = m_overflowRect.y() - m_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 941 matching lines @@
 void RenderLayerScrollableArea::setForceNeedsCompositedScrolling(ForceNeedsCompositedScrollingMode mode)
 {
     if (m_forceNeedsCompositedScrolling == mode)
         return;
 
     m_forceNeedsCompositedScrolling = mode;
     layer()->didUpdateNeedsCompositedScrolling();
 }
 
 } // Namespace WebCore