For fd.o notifications, we are taking the sender's PID into
account when associating notifications with sources (mainly
to deal with notify-send).
This broke when the implementation under the well-known name
was moved into a separate service, as the implementation in
gnome-shell will now always see the public notification-daemon
as sender.
Restore the old behavior by resolving the sender PID in the
separate service, and pass it as hint to the implementation
in gnome-shell.
https://gitlab.gnome.org/GNOME/gnome-shell/-/issues/2592
Add a small service that exposes the Fdo notification API under the
well-known name, and forwards any requests to the actual implementation
in the shell.
That way any app with permission to talk to org.freedesktop.Notifications
will get exactly that, and nothing more.
https://gitlab.gnome.org/GNOME/gnome-shell/merge_requests/547
