Fix nested unicode-bidi: isolate

Source/core/rendering/InlineIterator.h

 /*
  * Copyright (C) 2000 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2003, 2004, 2006, 2007, 2008, 2009, 2010 Apple Inc. All right reserved.
  * Copyright (C) 2010 Google Inc. All rights reserved.
  *
  * 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
  * version 2 of the License, or (at your option) any later version.
  *
@@ skipping 399 matching lines @@
 
 static inline bool isIsolatedInline(RenderObject* object)
 {
     ASSERT(object);
     return object->isRenderInline() && isIsolated(object->style()->unicodeBidi());
 }
 
 static inline RenderObject* containingIsolate(RenderObject* object, RenderObject* root)
 {
     ASSERT(object);
+    RenderObject* containingIsolateObj = 0;
     while (object && object != root) {
+        if (containingIsolateObj && !isIsolatedInline(object))
+            break;
+
         if (isIsolatedInline(object))
-            return object;
+            containingIsolateObj = object;
+
         object = object->parent();
     }
-    return 0;
+    return containingIsolateObj;
 }
 
 static inline unsigned numberOfIsolateAncestors(const InlineIterator& iter)
 {
     RenderObject* object = iter.object();
     if (!object)
         return 0;
     unsigned count = 0;
     while (object && object != iter.root()) {
         if (isIsolatedInline(object))
@@ skipping 101 matching lines @@
         m_sor = m_eor;
     }
 
     m_direction = WTF::Unicode::OtherNeutral;
     m_status.eor = WTF::Unicode::OtherNeutral;
 }
 
 }
 
 #endif // InlineIterator_h