Fix nested unicode-bidi: isolate

Source/core/rendering/InlineIterator.h

Index: Source/core/rendering/InlineIterator.h
diff --git a/Source/core/rendering/InlineIterator.h b/Source/core/rendering/InlineIterator.h
index eae2dca791056ad703309473d0d774795fd61628..d88205ae92425e121e171ac28d5876fa629ad7e0 100644
--- a/Source/core/rendering/InlineIterator.h
+++ b/Source/core/rendering/InlineIterator.h
@@ -417,12 +417,17 @@ static inline bool isIsolatedInline(RenderObject* object)
 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)