Ticket #31964: unload-function-replaceable.patch

updates.js

@@ -538 +538 @@
          * If an update is on-going and a user attempts to leave the page,
          * open an "Are you sure?" alert.
          */
-        $( window ).on( 'beforeunload', function() {
+        wp.updates.beforeunload = function() {
                 if ( wp.updates.updateLock ) {
                         return wp.updates.l10n.beforeunload;
                 }
-        });
+        }
+        
+        $( window ).on( 'beforeunload', wp.updates.beforeunload);
+        
+        $(document).trigger( 'wp-plugin-shinyupdates-loaded' );
 
 })( jQuery, window.wp, window.pagenow, window.ajaxurl );