Keep pristine state when attached to input tag

Author: Dmitry Dedukhin

src/select2.js

@@ -206,9 +206,14 @@ angular.module('ui.select2', []).value('uiSelect2Config', {}).directive('uiSelec
 
           // Not sure if I should just check for !isSelect OR if I should check for 'tags' key
           if (!opts.initSelection && !isSelect) {
+            var isPristine = controller.$pristine;
             controller.$setViewValue(
               convertToAngularModel(elm.select2('data'))
             );
+            if (isPristine) {
+              controller.$setPristine();
+            }
+            elm.prev().toggleClass('ng-pristine', controller.$pristine);
           }
         });
       };