the drag handler's mouseout func should check if the mouse left the map viewport div as opposed to the map div, r=ahocevar (closes #2941)

git-svn-id: http://svn.openlayers.org/trunk/openlayers@10956 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

tests/Handler/Drag.html

@@ -251,7 +251,7 @@
             t.ok(evt.xy.x == testEvents.done.xy.x &&
                  evt.xy.y == testEvents.done.xy.y,
                  "mouseout calls Util.mouseLeft with the correct event");
-            t.eq(element.id, map.div.id,
+            t.eq(element.id, map.viewPortDiv.id,
                  "mouseout calls Util.mouseLeft with the correct element");
             return true;
         }