Merge pull request #3507 from RyanDale/issue-3503

Fixes #3503: Removes redundant 'open' event trigger

src/js/select2/core.js

@@ -396,8 +396,6 @@ define([
     }
 
     this.trigger('query', {});
-
-    this.trigger('open');
   };
 
   Select2.prototype.close = function () {