Fix ui-select2 in Angular 1.2.3

fixed angular/angular.js#5219

Author: Burgov

src/select2.js

@@ -143,7 +143,9 @@ angular.module('ui.select2', []).value('uiSelect2Config', {}).directive('uiSelec
 
           if (!isSelect) {
             // Set the view and model value and update the angular template manually for the ajax/multiple select2.
-            elm.bind("change", function () {
+            elm.bind("change", function (e) {
+              e.stopImmediatePropagation();
+              
               if (scope.$$phase || scope.$root.$$phase) {
                 return;
               }