[gnome-shell/wip/rstrode/rhel-7.9: 83/86] panelMenu: Add a destroy handler to panel menu

[Ray Strode <halfline src gnome org>]

commit f96ee59662134ad5edebc7127939e4febf6642ac
Author: Ray Strode <rstrode redhat com>
Date:   Tue Oct 6 10:37:54 2020 -0400

    panelMenu: Add a destroy handler to panel menu
    
    This prevents some spew from classic mode extensions

 js/ui/panelMenu.js | 5 +++++
 1 file changed, 5 insertions(+)
---
diff --git a/js/ui/panelMenu.js b/js/ui/panelMenu.js
index b23d8e49fe..c44e91f8c1 100644
--- a/js/ui/panelMenu.js
+++ b/js/ui/panelMenu.js
@@ -192,7 +192,12 @@ var Button = new Lang.Class({
         this.actor.destroy();
 
         this.emit('destroy');
+    },
+
+    _onDestroy() {
+        /* Just a placeholder for newer extension compatibility */
     }
+
 });
 Signals.addSignalMethods(Button.prototype);