Update <select> when any of its <option> children has "display: none"

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 78 matching lines @@
 }
 
 void HTMLOptGroupElement::detach(const AttachContext& context)
 {
     m_style.clear();
     HTMLElement::detach(context);
 }
 
 void HTMLOptGroupElement::updateNonRenderStyle()
 {
+    bool oldDisplayNoneStatus = isDisplayNone();
     m_style = originalStyleForRenderer();
+    if (oldDisplayNoneStatus != isDisplayNone()) {
+        if (HTMLSelectElement* select = ownerSelectElement())
+            select->updateListOnRenderer();
+    }
 }
 
 RenderStyle* HTMLOptGroupElement::nonRendererStyle() const
 {
     return m_style.get();
 }
 
 PassRefPtr<RenderStyle> HTMLOptGroupElement::customStyleForRenderer()
 {
     updateNonRenderStyle();
@@ skipping 18 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);
 }
 
+bool HTMLOptGroupElement::isDisplayNone() const
+{
+    RenderStyle* style = nonRendererStyle();
+    return style && style->display() == NONE;
+}
+
 } // namespace