unicode-bidi: isolate is creating duplicated runs

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 631 matching lines @@
             // It's OK to add runs for zero-length RenderObjects, just don't make the run larger than it should be
             int end = obj->length() ? pos + 1 : 0;
             if (isolateTracker.inIsolate())
                 addFakeRunIfNecessary(obj, start, end, *this, isolateTracker);
             else
                 adjustMidpointsAndAppendRunsForObjectIfNeeded(obj, start, end, *this, AppendingRunsForObject, isolateTracker);
         }
 
         if (isEndOfLine)
             m_reachedEndOfLine = true;
-        m_eor.increment();
+        // If isolateTrack is inIsolate, the next |start of run| can not be the current isolated renderer.
+        if (isolateTracker.inIsolate())
+            m_eor.moveTo(bidiNextSkippingEmptyInlines(m_eor.root(), m_eor.object()), 0);
+        else
+            m_eor.increment();
         m_sor = m_eor;
     }
 
     m_direction = WTF::Unicode::OtherNeutral;
     m_status.eor = WTF::Unicode::OtherNeutral;
 }
 
 }
 
 #endif // InlineIterator_h