Make user-select:none not to affect editability

Source/core/rendering/RenderObject.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Dirk Mueller (mueller@kde.org)
  *           (C) 2004 Allan Sandfeld Jensen (kde@carewolf.com)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2009 Google Inc. All rights reserved.
  * Copyright (C) 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  *
  * This library is free software; you can redistribute it and/or
@@ skipping 1625 matching lines @@
     showRenderObject(printedCharacters);
     if (!this)
         return;
 
     for (const RenderObject* child = firstChild(); child; child = child->nextSibling())
         child->showRenderTreeAndMark(markedObject1, markedLabel1, markedObject2, markedLabel2, depth + 1);
 }
 
 #endif // NDEBUG
 
+static bool shouldUseSelectionColor(const RenderStyle& style)
+{
+    return style.userSelect() != SELECT_NONE || style.userModify() != READ_ONLY;
+}
+
 Color RenderObject::selectionBackgroundColor() const
 {
     Color color;
-    if (style()->userSelect() != SELECT_NONE) {
+    if (shouldUseSelectionColor(*style())) {
         RefPtr<RenderStyle> pseudoStyle = getUncachedPseudoStyle(PseudoStyleRequest(SELECTION));
         if (pseudoStyle && pseudoStyle->visitedDependentColor(CSSPropertyBackgroundColor).isValid())
             color = pseudoStyle->visitedDependentColor(CSSPropertyBackgroundColor).blendWithWhite();
         else
             color = frame()->selection()->isFocusedAndActive() ?
                     theme()->activeSelectionBackgroundColor() :
                     theme()->inactiveSelectionBackgroundColor();
     }
 
     return color;
 }
 
 Color RenderObject::selectionColor(int colorProperty) const
 {
     Color color;
     // If the element is unselectable, or we are only painting the selection,
     // don't override the foreground color with the selection foreground color.
-    if (style()->userSelect() == SELECT_NONE
+    if (!shouldUseSelectionColor(*style())
         || (frame()->view()->paintBehavior() & PaintBehaviorSelectionOnly))
         return color;
 
     if (RefPtr<RenderStyle> pseudoStyle = getUncachedPseudoStyle(PseudoStyleRequest(SELECTION))) {
         color = pseudoStyle->visitedDependentColor(colorProperty);
         if (!color.isValid())
             color = pseudoStyle->visitedDependentColor(CSSPropertyColor);
     } else
         color = frame()->selection()->isFocusedAndActive() ?
                 theme()->activeSelectionForegroundColor() :
@@ skipping 1554 matching lines @@
 {
     if (object1) {
         const WebCore::RenderObject* root = object1;
         while (root->parent())
             root = root->parent();
         root->showRenderTreeAndMark(object1, "*", object2, "-", 0);
     }
 }
 
 #endif