Never ignore HTMLLabelElement's click() calls

Source/core/html/HTMLLabelElement.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2010 Apple Inc. All rights reserved.
  *           (C) 2006 Alexey Proskuryakov (ap@nypop.com)
  *
  * 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 10 matching lines @@
  * Boston, MA 02110-1301, USA.
  *
  */
 
 #include "config.h"
 #include "core/html/HTMLLabelElement.h"
 
 #include "HTMLNames.h"
 #include "core/dom/ElementTraversal.h"
 #include "core/editing/FrameSelection.h"
-#include "core/events/Event.h"
+#include "core/events/MouseEvent.h"
 #include "core/frame/LocalFrame.h"
 #include "core/html/FormAssociatedElement.h"
 
 namespace WebCore {
 
 using namespace HTMLNames;
 
 static bool supportsLabels(const Element& element)
 {
     if (!element.isHTMLElement())
@@ skipping 89 matching lines @@
         node = node->parentOrShadowHostNode();
     }
     return false;
 }
 
 void HTMLLabelElement::defaultEventHandler(Event* evt)
 {
     static bool processingClick = false;
 
     if (evt->type() == EventTypeNames::click && !processingClick) {
-        // If text of label element is selected, do not pass
-        // the event to control element.
-        if (document().frame()->selection().selection().isRange())
+        // If the click is not simulated and the text of label element is
+        // selected, do not pass the event to control element.
+        // Note: a click event may be not a mouse event if created by
+        // document.createEvent().
+        if (evt->isMouseEvent() && !toMouseEvent(evt)->isSimulated() && document().frame()->selection().selection().isRange())
             return;
 
         RefPtrWillBeRawPtr<HTMLElement> element = control();
 
         // If we can't find a control or if the control received the click
         // event, then there's no need for us to do anything.
         if (!element || (evt->target() && element->containsIncludingShadowDOM(evt->target()->toNode())))
             return;
 
         if (evt->target() && isInInteractiveContent(evt->target()->toNode()))
@@ skipping 35 matching lines @@
 
 void HTMLLabelElement::accessKeyAction(bool sendMouseEvents)
 {
     if (HTMLElement* element = control())
         element->accessKeyAction(sendMouseEvents);
     else
         HTMLElement::accessKeyAction(sendMouseEvents);
 }
 
 } // namespace