Fix selection residue in sub-pixel positioned element

Source/core/rendering/RenderSelectionInfo.h

 /*
  * Copyright (C) 2000 Lars Knoll (knoll@kde.org)
  *           (C) 2000 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Dirk Mueller (mueller@kde.org)
  *           (C) 2004 Allan Sandfeld Jensen (kde@carewolf.com)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009 Apple Inc. 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 57 matching lines @@
             // FIXME: groupedMapping() leaks the squashing abstraction. See RenderBlockSelectionInfo for more details.
             if (m_repaintContainer && m_repaintContainer->layer()->groupedMapping())
                 RenderLayer::mapRectToPaintInvalidationBacking(m_repaintContainer, m_repaintContainer, m_rect);
         } else {
             m_rect = LayoutRect();
         }
     }
 
     void repaint()
     {
-        m_object->invalidatePaintUsingContainer(m_repaintContainer, m_rect, InvalidationSelection);
+        m_object->invalidatePaintUsingContainer(m_repaintContainer, enclosingIntRect(m_rect), InvalidationSelection);
     }
 
     LayoutRect rect() const { return m_rect; }
 
 private:
     LayoutRect m_rect; // relative to repaint container
 };
 
 
 // This struct is used when the selection changes to cache the old and new state of the selection for each RenderBlock.
 class RenderBlockSelectionInfo : public RenderSelectionInfoBase {
 public:
     RenderBlockSelectionInfo(RenderBlock* b)
         : RenderSelectionInfoBase(b)
     {
         if (b->canUpdateSelectionOnRootLineBoxes())
             m_rects = block()->selectionGapRectsForRepaint(m_repaintContainer);
         else
             m_rects = GapRects();
     }
 
     void repaint()
     {
         LayoutRect repaintRect = m_rects;
         // FIXME: this is leaking the squashing abstraction. However, removing the groupedMapping() condiitional causes
         // RenderBox::mapRectToPaintInvalidationBacking to get called, which makes rect adjustments even if you pass the same
         // repaintContainer as the render object. Find out why it does that and fix.
         if (m_repaintContainer && m_repaintContainer->layer()->groupedMapping())
             RenderLayer::mapRectToPaintInvalidationBacking(m_repaintContainer, m_repaintContainer, repaintRect);
-        m_object->invalidatePaintUsingContainer(m_repaintContainer, repaintRect, InvalidationSelection);
+        m_object->invalidatePaintUsingContainer(m_repaintContainer, enclosingIntRect(repaintRect), InvalidationSelection);
     }
 
     RenderBlock* block() const { return toRenderBlock(m_object); }
     GapRects rects() const { return m_rects; }
 
 private:
     GapRects m_rects; // relative to repaint container
 };
 
 } // namespace blink
 
 
 #endif // RenderSelectionInfo_h