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

Source/core/rendering/RenderListBox.h

 /*
  * This file is part of the select element renderer in WebCore.
  *
  * Copyright (C) 2006, 2007, 2009 Apple 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:
  *
  * 1.  Redistributions of source code must retain the above copyright
@@ skipping 136 matching lines @@
     void paintItemBackground(PaintInfo&, const LayoutPoint&, int listIndex);
     void scrollToRevealSelection();
 
     bool m_optionsChanged;
     bool m_scrollToRevealSelectionAfterLayout;
     bool m_inAutoscroll;
     int m_optionsWidth;
     int m_indexOffset;
 
     RefPtr<Scrollbar> m_vBar;
+    Vector<int> m_listItemIndex;

[esprehn, 2014/03/21 20:43:39]

It seems unfortunate to keep this Vector the size of the options around when
almost no real pages use display: none, so this is just wasting memory.

[spartha, 2014/03/21 21:29:03]

Yeah, totally agree. The only reason I want to use it, is to keep the code
simple.

 };
 
 DEFINE_RENDER_OBJECT_TYPE_CASTS(RenderListBox, isListBox());
 
 } // namepace WebCore
 
 #endif // RenderListBox_h