ASSERTION FAILED: !m_overflow

third_party/WebKit/Source/core/layout/line/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 922 matching lines @@
         } else {
             addReplacedChildOverflow(curr, logicalLayoutOverflow, logicalVisualOverflow);
         }
     }
 
     setOverflowFromLogicalRects(logicalLayoutOverflow, logicalVisualOverflow, lineTop, lineBottom);
 }
 
 void InlineFlowBox::setLayoutOverflow(const LayoutRect& rect, const LayoutRect& frameBox)
 {
+    ASSERT(!knownToHaveNoOverflow());
     if (frameBox.contains(rect) || rect.isEmpty())
         return;
 
     if (!m_overflow)
         m_overflow = adoptPtr(new OverflowModel(frameBox, frameBox));
 
     m_overflow->setLayoutOverflow(rect);
 }
 
 void InlineFlowBox::setVisualOverflow(const LayoutRect& rect, const LayoutRect& frameBox)
 {
+    ASSERT(!knownToHaveNoOverflow());
     if (frameBox.contains(rect) || rect.isEmpty())
         return;
 
     if (!m_overflow)
         m_overflow = adoptPtr(new OverflowModel(frameBox, frameBox));
 
     m_overflow->setVisualOverflow(rect);
 }
 
 void InlineFlowBox::setOverflowFromLogicalRects(const LayoutRect& logicalLayoutOverflow, const LayoutRect& logicalVisualOverflow, LayoutUnit lineTop, LayoutUnit lineBottom)
 {
+    ASSERT(!knownToHaveNoOverflow());
     LayoutRect frameBox = frameRectIncludingLineHeight(lineTop, lineBottom);
 
     LayoutRect layoutOverflow(isHorizontal() ? logicalLayoutOverflow : logicalLayoutOverflow.transposedRect());
     setLayoutOverflow(layoutOverflow, frameBox);
 
     LayoutRect visualOverflow(isHorizontal() ? logicalVisualOverflow : logicalVisualOverflow.transposedRect());
     setVisualOverflow(visualOverflow, frameBox);
 }
 
 bool InlineFlowBox::nodeAtPoint(HitTestResult& result, const HitTestLocation& locationInContainer, const LayoutPoint& accumulatedOffset, LayoutUnit lineTop, LayoutUnit lineBottom)
@@ skipping 329 matching lines @@
         ASSERT(child->prevOnLine() == prev);
         prev = child;
     }
     ASSERT(prev == m_lastChild);
 #endif
 }
 
 #endif
 
 } // namespace blink