GNOME Bugzilla – Bug 684506
Super+M doesn't toggle message tray back
Last modified: 2012-09-20 22:36:05 UTC
gnome-shell-3.5.91-1.fc18.x86_64 Super+M will show the message tray, but using Super+M again won't hide it.
It's a rather complex issue - I have local patches, but those are way out of scope for 3.6. *** This bug has been marked as a duplicate of bug 682229 ***