[gnome-shell] Hide the user menu in the GDM greeter lock screen

[Giovanni Campagna <gcampagna src gnome org>]

commit 785be2f327762fb473629dd2b99e286d0694d644
Author: Giovanni Campagna <gcampagna src gnome org>
Date:   Mon Sep 10 11:34:49 2012 +0200

    Hide the user menu in the GDM greeter lock screen
    
    https://bugzilla.gnome.org/show_bug.cgi?id=683705

 js/ui/sessionMode.js |    1 +
 js/ui/userMenu.js    |    2 ++
 2 files changed, 3 insertions(+), 0 deletions(-)
---
diff --git a/js/ui/sessionMode.js b/js/ui/sessionMode.js
index 14e1ff1..082c0f6 100644
--- a/js/ui/sessionMode.js
+++ b/js/ui/sessionMode.js
@@ -48,6 +48,7 @@ const _modes = {
 
     'lock-screen': {
         isLocked: true,
+        isGreeter: undefined,
         unlockDialog: undefined,
         components: ['networkAgent', 'polkitAgent', 'telepathyClient'],
         panel: {
diff --git a/js/ui/userMenu.js b/js/ui/userMenu.js
index bb3e1a5..fcac6cd 100644
--- a/js/ui/userMenu.js
+++ b/js/ui/userMenu.js
@@ -577,6 +577,8 @@ const UserMenuButton = new Lang.Class({
     },
 
     _sessionUpdated: function() {
+        this.actor.visible = !Main.sessionMode.isGreeter;
+
         let allowSettings = Main.sessionMode.allowSettings;
         this._statusChooser.setSensitive(allowSettings);
         this._systemSettings.visible = allowSettings;