--- a/src/3rdparty/webkit/WebCore/rendering/RenderBox.cpp	Fri Apr 16 15:50:13 2010 +0300
+++ b/src/3rdparty/webkit/WebCore/rendering/RenderBox.cpp	Mon May 03 13:17:34 2010 +0300
@@ -145,6 +145,16 @@
                 removeFloatingOrPositionedChildFromBlockLists();
         }
     }
+    if (FrameView *frameView = view()->frameView()) {
+        bool newStyleIsFixed = newStyle && newStyle->position() == FixedPosition;
+        bool oldStyleIsFixed = style() && style()->position() == FixedPosition;
+        if (newStyleIsFixed != oldStyleIsFixed) {
+            if (newStyleIsFixed)
+                frameView->addFixedObject();
+            else
+                frameView->removeFixedObject();
+        }
+    }
 
     RenderBoxModelObject::styleWillChange(diff, newStyle);
 }