[Regression] Fix Draggable is float:left and container is overflow:hidden

Source/core/rendering/InlineFlowBox.cpp

 /*
  * 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
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 1124 matching lines @@
         } else {
             // Paint our background, border and box-shadow.
             paintBoxDecorations(paintInfo, paintOffset);
         }
     }
 
     if (paintInfo.phase == PaintPhaseMask)
         return;
 
     PaintPhase paintPhase = paintInfo.phase == PaintPhaseChildOutlines ? PaintPhaseOutline : paintInfo.phase;
-    PaintInfo childInfo(paintInfo);
-    childInfo.phase = paintPhase;
-    childInfo.updatePaintingRootForChildren(&renderer());
 
     // Paint our children.
     if (paintPhase != PaintPhaseSelfOutline) {
+        PaintInfo childInfo(paintInfo);
+        childInfo.phase = paintPhase;
+
+        if (childInfo.paintingRoot && childInfo.paintingRoot->isDescendantOf(&renderer()))
+            childInfo.paintingRoot = 0;
+        else
+            childInfo.updatePaintingRootForChildren(&renderer());
+
         for (InlineBox* curr = firstChild(); curr; curr = curr->nextOnLine()) {
             if (curr->renderer().isText() || !curr->boxModelObject()->hasSelfPaintingLayer())
                 curr->paint(childInfo, paintOffset, lineTop, lineBottom);
         }
     }
 }
 
 void InlineFlowBox::paintFillLayers(const PaintInfo& paintInfo, const Color& c, const FillLayer* fillLayer, const LayoutRect& rect, CompositeOperator op)
 {
     if (!fillLayer)
@@ skipping 495 matching lines @@
         ASSERT(child->prevOnLine() == prev);
         prev = child;
     }
     ASSERT(prev == m_lastChild);
 #endif
 }
 
 #endif
 
 } // namespace WebCore