WordPress/wp-admin/js/user-suggest.js

(function(a){var b="undefined"!==typeof current_site_id?"&site_id="+current_site_id:"";a(document).ready(function(){a(".wp-suggest-user").autocomplete({source:ajaxurl+"?action=autocomplete-user&autocomplete_type=add"+b,delay:500,minLength:2,position:("undefined"!==typeof isRtl&&isRtl)?{my:"right top",at:"right bottom",offset:"0, -1"}:{offset:"0, -1"},open:function(){a(this).addClass("open")},close:function(){a(this).removeClass("open")}})})})(jQuery);