notify parent when was moved (performance refactor) fix

Author: mapmf

src/sortable.js

@@ -322,6 +322,10 @@ angular.module('ui.sortable', [])
               // Save current drop position but only if this is not a second
               // update that happens when moving between lists because then
               // the value will be overwritten with the old value
+
+              var wasMoved = ('dropindex' in ui.item.sortable) &&
+                              !ui.item.sortable.isCanceled();
+
               if(!ui.item.sortable.received) {
                 ui.item.sortable.dropindex = getItemIndex(ui.item);
                 var droptarget = ui.item.closest('[ui-sortable]');