use merged newData in case where an option already exists when using ArrayAdapter

src/js/select2/data/array.js

@@ -54,7 +54,7 @@ define([
         var existingData = this.item($existingOption);
         var newData = $.extend(true, {}, existingData, item);
 
-        var $newOption = this.option(existingData);
+        var $newOption = this.option(newData);
 
         $existingOption.replaceWith($newOption);