Elements moved from a shadow root to a detached tree should clear their IsInShadowTree Flag

Source/core/dom/Element.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Peter Kelly (pmk@post.com)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2003-2011, 2013, 2014 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 778 matching lines @@
         setFlag(InDocumentFlag);
     if (parentOrShadowHostNode()->isInShadowTree())
         setFlag(IsInShadowTreeFlag);
     if (childNeedsDistributionRecalc() && !insertionPoint->childNeedsDistributionRecalc())
         insertionPoint->markAncestorsWithChildNeedsDistributionRecalc();
     return InsertionDone;
 }
 
 inline void Node::removedFrom(ContainerNode* insertionPoint)
 {
-    ASSERT(insertionPoint->inDocument() || isContainerNode());
+    ASSERT(insertionPoint->inDocument() || isContainerNode() || isInShadowTree());

[rhogan, 2015/06/24 20:34:41]

I didn't use isInTreeScope() here as it would expand the ASSERT to allow
inDocument() as an alternative to insertionPoint->inDocument, and that appears
to be unnecessary.

     if (insertionPoint->inDocument())
         clearFlag(InDocumentFlag);
     if (isInShadowTree() && !treeScope().rootNode().isShadowRoot())
         clearFlag(IsInShadowTreeFlag);
 }
 
 inline void Element::invalidateStyleAttribute()
 {
     ASSERT(elementData());
     elementData()->m_styleAttributeIsDirty = true;
@@ skipping 67 matching lines @@
     static PassRefPtrWillBeRawPtr<T> create(const QualifiedName&, Document&)
 #define DEFINE_ELEMENT_FACTORY_WITH_TAGNAME(T) \
     PassRefPtrWillBeRawPtr<T> T::create(const QualifiedName& tagName, Document& document) \
     { \
         return adoptRefWillBeNoop(new T(tagName, document)); \
     }
 
 } // namespace
 
 #endif // Element_h