[gnome-shell] keyboard: Disable "tray" button in lock/login screen

[Florian MÃllner <fmuellner src gnome org>]

commit 18eedbc02ddf3bd9b75c80980cf875c82836143e
Author: Florian MÃllner <fmuellner gnome org>
Date:   Mon Sep 24 21:52:47 2012 +0200

    keyboard: Disable "tray" button in lock/login screen
    
    It is not possible to summon the tray via shortcut or dwelling
    while the screen is locked, so it is odd to allow it from the
    on-screen-keyboard.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=683546

 js/ui/keyboard.js |    7 +++++++
 1 files changed, 7 insertions(+), 0 deletions(-)
---
diff --git a/js/ui/keyboard.js b/js/ui/keyboard.js
index 2389ba5..4d97a9d 100644
--- a/js/ui/keyboard.js
+++ b/js/ui/keyboard.js
@@ -349,6 +349,13 @@ const Keyboard = new Lang.Class({
             trayButton.reactive = true;
             trayButton.remove_style_pseudo_class('grayed');
         }));
+        Main.sessionMode.connect('updated', Lang.bind(this, function() {
+            trayButton.reactive = !Main.sessionMode.isLocked;
+            if (Main.sessionMode.isLocked)
+                trayButton.add_style_pseudo_class('grayed');
+            else
+                trayButton.remove_style_pseudo_class('grayed');
+        }));
 
         return trayButton;
     },