Very few of the panel comments provide information that is very
useful. Update them to supplement the panel descriptions - this
will make the search results more helpful.
https://bugzilla.gnome.org/show_bug.cgi?id=694110
Show applications using the message tray, and
allow configuring in what way the shell presents them.
The set of applications shown include all applications that ever
showed a notification in gnome-shell and all applications that have
a boolean X-GNOME-UsesNotifications key set to true in their desktop file.
https://bugzilla.gnome.org/show_bug.cgi?id=685928