+ _selectionDiff : function(initialSelection, modifiedSelection){
+ var deltaMinus = qx.lang.Array.clone(initialSelection);
+ var deltaPlus = qx.lang.Array.clone(modifiedSelection);
+ qx.lang.Array.exclude(deltaPlus, initialSelection);
+ qx.lang.Array.exclude(deltaMinus, modifiedSelection);
+ return {deltaPlus : deltaPlus, deltaMinus : deltaMinus};
+ },
+