jQuery: Fix js requiring jQuery < 3.0 compatibility

js/filedrop.field.js

@@ -292,8 +292,6 @@
  */
 ;(function($) {
 
-  jQuery.event.props.push("dataTransfer");
-
   var default_opts = {
       fallback_id: '',
       link: false,

js/redactor-osticket.js

@@ -394,3 +394,7 @@ $(document).ajaxError(function(event, request, settings) {
             __('Refresh the current page to restore and continue your draft.'));
     }
 });
+
+// .size() is deprecated as of jQuery 1.8 and should move to .length, but
+// the packed Redactor code uses the deprecated function
+$.fn.size = function() { return this.length; }

scp/js/jquery.dropdown.js

@@ -63,7 +63,7 @@ if(jQuery) (function($) {
 
 	function hideDropdowns(event) {
 
-		var targetGroup = event ? $(event.target).parents().andSelf() : null;
+		var targetGroup = event ? $(event.target).parents().addBack() : null;
 		if( targetGroup && targetGroup.is('.action-dropdown') && !targetGroup.is('a') ) return;
 
 		$('body')