Disabled select element should not fire onchange event. When dragging a disabled select element it …

Source/core/html/HTMLSelectElement.cpp

 /*
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
  * 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, 2009, 2010, 2011 Apple Inc. All rights reserved.
  *           (C) 2006 Alexey Proskuryakov (ap@nypop.com)
  * Copyright (C) 2010 Google Inc. All rights reserved.
  * Copyright (C) 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  *
@@ skipping 618 matching lines @@
     }
 
     scrollToSelection();
     setNeedsValidityCheck();
     notifyFormStateChanged();
 }
 
 void HTMLSelectElement::listBoxOnChange()
 {
     ASSERT(!usesMenuList() || m_multiple);
+    if (isDisabledFormControl())
+        return;
 
     const Vector<HTMLElement*>& items = listItems();
 
     // If the cached selection list is empty, or the size has changed, then fire
     // dispatchFormControlChangeEvent, and return early.
     if (m_lastOnChangeSelection.isEmpty() || m_lastOnChangeSelection.size() != items.size()) {
         dispatchFormControlChangeEvent();
         return;
     }
 
@@ skipping 908 matching lines @@
     const Vector<HTMLElement*>& items = listItems();
     for (unsigned i = 0; i < items.size(); ++i) {
         if (items[i]->hasTagName(optionTag))
             ++options;
     }
 
     return options;
 }
 
 } // namespace