Merge 116357

Source/WebCore/rendering/RenderBlock.cpp

Index: Source/WebCore/rendering/RenderBlock.cpp
===================================================================
--- Source/WebCore/rendering/RenderBlock.cpp	(revision 118055)
+++ Source/WebCore/rendering/RenderBlock.cpp	(working copy)
@@ -610,6 +610,13 @@
             currChildNextSibling = 0; // We destroyed the last child, so now we need to update
                                       // the value of currChildNextSibling.
 
+        // It is possible that positioned objects under blockCurr are going to be moved to cloneBlock.
+        // Since we are doing layout anyway, it is easier to blow away the entire list, than
+        // traversing down the subtree looking for positioned children and then remove them
+        // from our positioned objects list.
+        if (currChildNextSibling)
+            blockCurr->removePositionedObjects(0);
+
         // Now we need to take all of the children starting from the first child
         // *after* currChild and append them all to the clone.
         blockCurr->moveChildrenTo(cloneBlock, currChildNextSibling, 0, true);