Make extend truly come last

modules/backend/widgets/Lists.php

@@ -412,13 +412,17 @@ class Lists extends WidgetBase
             $callback($query);
         }
 
+        /*
+         * Add custom selects
+         */
+        $query->select($selects);
+
         /*
          * Extensibility
          */
         Event::fire('backend.list.extendQuery', [$this, $query]);
         $this->fireEvent('list.extendQuery', [$query]);
 
-        $query->select($selects);
         return $query;
     }