Ignore pos argument if the first render object is not the current one.

Source/core/rendering/BidiRunForLine.cpp

 /*
  * Copyright (C) 2000 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2003, 2004, 2006, 2007, 2008, 2009, 2010, 2011 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 65 matching lines @@
 
         current = next;
     }
 
     return current;
 }
 
 TextDirection determinePlaintextDirectionality(RenderObject* root,
     RenderObject* current = 0, unsigned pos = 0)
 {
-    InlineIterator iter(root,
-        firstRenderObjectForDirectionalityDetermination(root, current), pos);
+    RenderObject* firstRenderObject = firstRenderObjectForDirectionalityDetermination(root, current);
+    InlineIterator iter(root, firstRenderObject, firstRenderObject == current ? pos : 0);
     InlineBidiResolver observer;
     observer.setStatus(BidiStatus(root->style()->direction(),
         isOverride(root->style()->unicodeBidi())));
     observer.setPositionIgnoringNestedIsolates(iter);
     return observer.determineParagraphDirectionality();
 }
 
 // FIXME: This should be a BidiStatus constructor or create method.
 static inline BidiStatus statusWithDirection(TextDirection textDirection,
     bool isOverride)
@@ skipping 108 matching lines @@
                 isolatedResolver.isolatedRuns());
             currentRoot = isolatedInline;
             restoreIsolatedMidpointStates(topResolver, isolatedResolver);
         }
     }
 }
 
 } // namespace blink
 
 #endif // BidiRunForLine_h