Support slotchange event

third_party/WebKit/Source/core/dom/Element.cpp

 /*
  * 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)
  *           (C) 2007 David Smith (catfish.man@gmail.com)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2012, 2013 Apple Inc. All rights reserved.
  *           (C) 2007 Eric Seidel (eric@webkit.org)
  *
  * This library is free software; you can redistribute it and/or
@@ skipping 1122 matching lines @@
         return value.lowerASCII();
     return value;
 }
 
 void Element::attributeChanged(const QualifiedName& name, const AtomicString& oldValue, const AtomicString& newValue, AttributeModificationReason reason)
 {
     if (ElementShadow* parentElementShadow = shadowWhereNodeCanBeDistributed(*this)) {
         if (shouldInvalidateDistributionWhenAttributeChanged(parentElementShadow, name, newValue))
             parentElementShadow->setNeedsDistributionRecalc();
     }
-    if (name == HTMLNames::slotAttr && isChildOfV1ShadowHost())
+    if (name == HTMLNames::slotAttr && isChildOfV1ShadowHost()) {
         parentElementShadow()->setNeedsDistributionRecalc();
+        document().updateAssignment();
+    }
 
     parseAttribute(name, oldValue, newValue);
 
     document().incDOMTreeVersion();
 
     if (name == HTMLNames::idAttr) {
         AtomicString oldId = elementData()->idForStyleResolution();
         AtomicString newId = makeIdForStyleResolution(newValue, document().inQuirksMode());
         if (newId != oldId) {
             elementData()->setIdForStyleResolution(newId);
@@ skipping 907 matching lines @@
 }
 
 void Element::childrenChanged(const ChildrenChange& change)
 {
     ContainerNode::childrenChanged(change);
 
     checkForEmptyStyleChange();
     if (!change.byParser && change.isChildElementChange())
         checkForSiblingStyleChanges(change.type == ElementRemoved ? SiblingElementRemoved : SiblingElementInserted, change.siblingBeforeChange, change.siblingAfterChange);
 
-    if (ElementShadow* shadow = this->shadow())
+    if (ElementShadow* shadow = this->shadow()) {
         shadow->setNeedsDistributionRecalc();
+        if (document().shadowCascadeOrder() == ShadowCascadeOrder::ShadowCascadeV1) {
+            if ((isShadowHost(*this) && shadowRoot()->isV1()) || isHTMLSlotElement(*this))
+                document().updateAssignment();
+        }
+    }
 }
 
 void Element::finishParsingChildren()
 {
     setIsFinishedParsingChildren(true);
     checkForEmptyStyleChange();
     checkForSiblingStyleChanges(FinishedParsingChildren, lastChild(), nullptr);
 }
 
 #ifndef NDEBUG
@@ skipping 1590 matching lines @@
 
 DEFINE_TRACE(Element)
 {
     if (hasRareData())
         visitor->trace(elementRareData());
     visitor->trace(m_elementData);
     ContainerNode::trace(visitor);
 }
 
 } // namespace blink