[gnome-shell] theme: Put back the transition from overview to desktop for the message tray

[Jasper St. Pierre <jstpierre src gnome org>]

commit 75ed427e046ac400f6f4edfc7f856e30d99ddaff
Author: Jasper St. Pierre <jstpierre mecheye net>
Date:   Mon Aug 20 14:59:51 2012 -0400

    theme: Put back the transition from overview to desktop for the message tray
    
    https://bugzilla.gnome.org/show_bug.cgi?id=682271

 data/theme/gnome-shell.css |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/data/theme/gnome-shell.css b/data/theme/gnome-shell.css
index fdc9731..b5c1204 100644
--- a/data/theme/gnome-shell.css
+++ b/data/theme/gnome-shell.css
@@ -1166,6 +1166,7 @@ StButton.popup-menu-item:insensitive {
 #message-tray {
     background: #2e3436 url(message-tray-background.png);
     background-repeat: repeat;
+    transition-duration: 250;
     height: 72px;
 }