SVG: SVGAnimateElement should not cache |m_animatedElements|

Source/core/svg/SVGElement.cpp

 /*
  * Copyright (C) 2004, 2005, 2006, 2007, 2008 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2004, 2005, 2006, 2008 Rob Buis <buis@kde.org>
  * Copyright (C) 2008 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Alp Toker <alp@atoker.com>
  * Copyright (C) 2009 Cameron McCormack <cam@mcc.id.au>
  *
  * 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 1024 matching lines @@
 }
 
 bool SVGElement::hasFocusEventListeners() const
 {
     return hasEventListeners(EventTypeNames::focusin) || hasEventListeners(EventTypeNames::focusout)
         || hasEventListeners(EventTypeNames::focus) || hasEventListeners(EventTypeNames::blur);
 }
 
 void SVGElement::invalidateInstances()
 {
-    if (!inDocument())
-        return;
-
     if (instanceUpdatesBlocked())
         return;
 
-    const WillBeHeapHashSet<RawPtrWillBeWeakMember<SVGElement> >& set = instancesForElement();
+    const WillBeHeapHashSet<RawPtrWillBeMember<SVGElement> >& set = instancesForElement();
     if (set.isEmpty())
         return;
 
+    // Take snapshot of the |set|, as it may be be modified from |invalidateShadowTree()|.
+    WillBeHeapVector<RawPtrWillBeWeakMember<SVGElement> > snapshot;
+    copyToVector(set, snapshot);
+
     // Mark all use elements referencing 'element' for rebuilding
-    const WillBeHeapHashSet<RawPtrWillBeWeakMember<SVGElement> >::const_iterator end = set.end();
-    for (WillBeHeapHashSet<RawPtrWillBeWeakMember<SVGElement> >::const_iterator it = set.begin(); it != end; ++it) {
-        (*it)->setCorrespondingElement(0);
+    for (WillBeHeapVector<RawPtrWillBeWeakMember<SVGElement> >::const_iterator it = snapshot.begin(), end = snapshot.end(); it != end; ++it) {
+        SVGElement* element = *it;
+        if (!element)
+            continue;
 
-        if (SVGUseElement* element = (*it)->correspondingUseElement()) {
-            ASSERT(element->inDocument());
-            element->invalidateShadowTree();
+        element->setCorrespondingElement(0);
+
+        if (SVGUseElement* useElement = element->correspondingUseElement()) {
+            ASSERT(useElement->inDocument());
+            useElement->invalidateShadowTree();
         }
     }
 
-    document().updateRenderTreeIfNeeded();
+    if (inDocument())
+        document().updateUseShadowTreesIfNeeded();
 }
 
 SVGElement::InstanceUpdateBlocker::InstanceUpdateBlocker(SVGElement* targetElement)
     : m_targetElement(targetElement)
 {
     if (m_targetElement)
         m_targetElement->setInstanceUpdatesBlocked(true);
 }
 
 SVGElement::InstanceUpdateBlocker::~InstanceUpdateBlocker()
@@ skipping 102 matching lines @@
         animatableAttributes.add(SVGNames::zAttr);
     }
 
     if (name == classAttr)
         return true;
 
     return animatableAttributes.contains(name);
 }
 #endif
 }