#2518 better check for hidden

src/definitions/modules/popup.js

@@ -687,7 +687,7 @@ $.fn.popup = function(parameters) {
             popup  = calculations.popup;
             parent = calculations.parent;
 
-            if(target.top === 0 && target.left === 0) {
+            if(target.width === 0 && target.height === 0) {
               module.debug('Popup target is hidden, no action taken');
               return false;
             }