Abs-positioned objects should move with inline rel-positioned containers when the latter change wid…

Source/core/rendering/line/BreakingContextInlineHeaders.h

 /*
  * Copyright (C) 2000 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2003, 2004, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All right reserved.
  * Copyright (C) 2010 Google Inc. All rights reserved.
  * Copyright (C) 2013 Adobe Systems Incorporated.
  *
  * 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.
@@ skipping 182 matching lines @@
     if (!shouldCollapseWhiteSpace(it.object()->style(), lineInfo, whitespacePosition) || it.object()->isBR())
         return true;
 
     UChar current = it.current();
     bool notJustWhitespace = current != ' ' && current != '\t' && current != softHyphen && (current != '\n' || it.object()->preservesNewline());
     return notJustWhitespace || isEmptyInline(it.object());
 }
 
 inline void setStaticPositions(RenderBlockFlow* block, RenderBox* child)
 {
+    ASSERT(child->isOutOfFlowPositioned());
     // FIXME: The math here is actually not really right. It's a best-guess approximation that
     // will work for the common cases
     RenderObject* containerBlock = child->container();
     LayoutUnit blockHeight = block->logicalHeight();
     if (containerBlock->isRenderInline()) {
         // A relative positioned inline encloses us. In this case, we also have to determine our
         // position as though we were an inline. Set |staticInlinePosition| and |staticBlockPosition| on the relative positioned
         // inline so that we can obtain the value later.
         toRenderInline(containerBlock)->layer()->setStaticInlinePosition(block->startAlignedOffsetForLine(blockHeight, false));
         toRenderInline(containerBlock)->layer()->setStaticBlockPosition(blockHeight);
+
+        // If |child| is a leading or trailing positioned object this is its only opportunity to ensure it moves with an inline
+        // container changing width.
+        child->moveWithEdgeOfInlineContainerIfNecessary(child->isHorizontalWritingMode());
     }
     block->updateStaticInlinePositionForChild(child, blockHeight);
     child->layer()->setStaticBlockPosition(blockHeight);
 }
 
 // FIXME: The entire concept of the skipTrailingWhitespace function is flawed, since we really need to be building
 // line boxes even for containers that may ultimately collapse away. Otherwise we'll never get positioned
 // elements quite right. In other words, we need to build this function's work into the normal line
 // object iteration process.
 // NB. this function will insert any floating elements that would otherwise
@@ skipping 679 matching lines @@
 
     if (style->textIndentType() == TextIndentHanging)
         shouldIndentText = shouldIndentText == IndentText ? DoNotIndentText : IndentText;
 
     return shouldIndentText;
 }
 
 }
 
 #endif // BreakingContextInlineHeaders_h