:hover style not applied on hover if its display property is different from original style's

Source/core/html/HTMLOptGroupElement.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, 2008, 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 76 matching lines @@
 
 void HTMLOptGroupElement::recalcSelectOptions()
 {
     ContainerNode* select = parentNode();
     while (select && !select->hasTagName(selectTag))
         select = select->parentNode();
     if (select)
         toHTMLSelectElement(select)->setRecalcListItems();
 }
 
-void HTMLOptGroupElement::attach()
+void HTMLOptGroupElement::attach(const AttachContext& context)
 {
-    HTMLElement::attach();
+    HTMLElement::attach(context);
     // If after attaching nothing called styleForRenderer() on this node we
     // manually cache the value. This happens if our parent doesn't have a
     // renderer like <optgroup> or if it doesn't allow children like <select>.
     if (!m_style && parentNode()->renderStyle())
         updateNonRenderStyle();
 }
 
-void HTMLOptGroupElement::detach()
+void HTMLOptGroupElement::detach(const AttachContext& context)
 {
     m_style.clear();
-    HTMLElement::detach();
+    HTMLElement::detach(context);
 }
 
 void HTMLOptGroupElement::updateNonRenderStyle()
 {
     m_style = originalStyleForRenderer();
 }
 
 RenderStyle* HTMLOptGroupElement::nonRendererStyle() const
 {
     return m_style.get();
@@ skipping 33 matching lines @@
 
 void HTMLOptGroupElement::accessKeyAction(bool)
 {
     HTMLSelectElement* select = ownerSelectElement();
     // send to the parent to bring focus to the list box
     if (select && !select->focused())
         select->accessKeyAction(false);
 }
 
 } // namespace