Merge 89165

Source/WebCore/rendering/RenderBlock.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2007 David Smith (catfish.man@gmail.com)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010 Apple Inc. All rights reserved.
  * Copyright (C) Research In Motion Limited 2010. 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 244 matching lines @@
 
     m_lineHeight = -1;
 
     // Update pseudos for :before and :after now.
     if (!isAnonymous() && document()->usesBeforeAfterRules() && canHaveChildren()) {
         updateBeforeAfterContent(BEFORE);
         updateBeforeAfterContent(AFTER);
     }
 
     // After our style changed, if we lose our ability to propagate floats into next sibling
-    // blocks, then we need to mark our descendants with floats for layout and clear all floats
-    // from next sibling blocks that exist in our floating objects list. See bug 56299.
+    // blocks, then we need to find the top most parent containing that overhanging float and
+    // then mark its descendants with floats for layout and clear all floats from its next
+    // sibling blocks that exist in our floating objects list. See bug 56299 and 62875.
     bool canPropagateFloatIntoSibling = !isFloatingOrPositioned() && !avoidsFloats();
     if (diff == StyleDifferenceLayout && s_canPropagateFloatIntoSibling && !canPropagateFloatIntoSibling && hasOverhangingFloats()) {
-        markAllDescendantsWithFloatsForLayout();
-        markSiblingsWithFloatsForLayout();
+        RenderBlock* parentBlock = this;
+        FloatingObjectSet& floatingObjectSet = m_floatingObjects->set();
+        FloatingObjectSetIterator end = floatingObjectSet.end();
+
+        for (RenderObject* curr = parent(); curr && !curr->isRenderView(); curr = curr->parent()) {
+            if (curr->isRenderBlock()) {
+                RenderBlock* currBlock = toRenderBlock(curr);
+
+                if (currBlock->hasOverhangingFloats()) {
+                    for (FloatingObjectSetIterator it = floatingObjectSet.begin(); it != end; ++it) {
+                        RenderBox* renderer = (*it)->renderer();
+                        if (currBlock->hasOverhangingFloat(renderer)) {
+                            parentBlock = currBlock;
+                            break;
+                        }
+                    }
+                }
+            }
+        }
+              
+        parentBlock->markAllDescendantsWithFloatsForLayout();
+        parentBlock->markSiblingsWithFloatsForLayout();
     }
 }
 
 void RenderBlock::updateBeforeAfterContent(PseudoId pseudoId)
 {
     // If this is an anonymous wrapper, then the parent applies its own pseudo-element style to it.
     if (parent() && parent()->createsAnonymousWrapper())
         return;
     return children()->updateBeforeAfterContent(this, pseudoId);
 }
@@ skipping 3453 matching lines @@
             
             // Since the float doesn't overhang, it didn't get put into our list.  We need to go ahead and add its overflow in to the
             // child now.
             if (r->m_isDescendant)
                 child->addOverflowFromChild(r->m_renderer, IntSize(xPositionForFloatIncludingMargin(r), yPositionForFloatIncludingMargin(r)));
         }
     }
     return lowestFloatLogicalBottom;
 }
 
+bool RenderBlock::hasOverhangingFloat(RenderBox* renderer)
+{
+    if (!m_floatingObjects || hasColumns() || !parent())
+        return false;
+
+    FloatingObjectSet& floatingObjectSet = m_floatingObjects->set();
+    FloatingObjectSetIterator it = floatingObjectSet.find<RenderBox*, FloatingObjectHashTranslator>(renderer);
+    if (it == floatingObjectSet.end())
+        return false;
+
+    return logicalBottomForFloat(*it) > logicalHeight();
+}
+
 void RenderBlock::addIntrudingFloats(RenderBlock* prev, int logicalLeftOffset, int logicalTopOffset)
 {
     // If the parent or previous sibling doesn't have any floats to add, don't bother.
     if (!prev->m_floatingObjects)
         return;
 
     logicalLeftOffset += (isHorizontalWritingMode() ? marginLeft() : marginTop());
 
     FloatingObjectSet& prevSet = prev->m_floatingObjects->set();
     FloatingObjectSetIterator prevEnd = prevSet.end();
@@ skipping 2594 matching lines @@
 void RenderBlock::showLineTreeAndMark(const InlineBox* markedBox1, const char* markedLabel1, const InlineBox* markedBox2, const char* markedLabel2, const RenderObject* obj) const
 {
     showRenderObject();
     for (const RootInlineBox* root = firstRootBox(); root; root = root->nextRootBox())
         root->showLineTreeAndMark(markedBox1, markedLabel1, markedBox2, markedLabel2, obj, 1);
 }
 
 #endif
 
 } // namespace WebCore