Dispatch synthetic events even when target and relatedTarget are identical

third_party/WebKit/Source/core/events/EventPath.cpp

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Neither the name of Google Inc. nor the names of its
@@ skipping 282 matching lines @@
 void EventPath::adjustForRelatedTarget(Node& target,
                                        EventTarget* relatedTarget) {
   if (!relatedTarget)
     return;
   Node* relatedNode = relatedTarget->toNode();
   if (!relatedNode)
     return;
   if (target.document() != relatedNode->document())
     return;
   retargetRelatedTarget(*relatedNode);
-  shrinkForRelatedTarget(target, *relatedNode);
+  shrinkForRelatedTarget(target);
 }
 
 void EventPath::retargetRelatedTarget(const Node& relatedTargetNode) {
   RelatedTargetMap relatedNodeMap;
   buildRelatedNodeMap(relatedTargetNode, relatedNodeMap);
 
   for (const auto& treeScopeEventContext : m_treeScopeEventContexts) {
     EventTarget* adjustedRelatedTarget =
         findRelatedNode(treeScopeEventContext->treeScope(), relatedNodeMap);
     DCHECK(adjustedRelatedTarget);
     treeScopeEventContext.get()->setRelatedTarget(adjustedRelatedTarget);
   }
 }
 
-void EventPath::shrinkForRelatedTarget(const Node& target,
-                                       const Node& relatedTarget) {
-  if (!target.isInShadowTree() && !relatedTarget.isInShadowTree())
-    return;
+bool EventPath::shouldStopEventPath(EventTarget& currentTarget,
+                                    EventTarget& currentRelatedTarget,
+                                    const Node& target) {
+  if (&currentTarget != &currentRelatedTarget)
+    return false;
+  if (m_event->isTrusted())
+    return true;
+  Node* currentTargetNode = currentTarget.toNode();
+  if (!currentTargetNode)
+    return false;
+  return currentTargetNode->treeScope() != target.treeScope();
+}
+
+void EventPath::shrinkForRelatedTarget(const Node& target) {
   for (size_t i = 0; i < size(); ++i) {
-    if (at(i).target() == at(i).relatedTarget()) {
-      // Event dispatching should be stopped here.
+    if (shouldStopEventPath(*at(i).target(), *at(i).relatedTarget(), target)) {
       shrink(i);
       break;
     }
   }
 }
 
 void EventPath::adjustForTouchEvent(TouchEvent& touchEvent) {
   HeapVector<Member<TouchList>> adjustedTouches;
   HeapVector<Member<TouchList>> adjustedTargetTouches;
   HeapVector<Member<TouchList>> adjustedChangedTouches;
@@ skipping 76 matching lines @@
 
 DEFINE_TRACE(EventPath) {
   visitor->trace(m_nodeEventContexts);
   visitor->trace(m_node);
   visitor->trace(m_event);
   visitor->trace(m_treeScopeEventContexts);
   visitor->trace(m_windowEventContext);
 }
 
 }  // namespace blink