Freeze exceptions for mutter and gnome-shell

[Jonas Ådahl <jadahl gmail com>]

Here are some freeze exception requests for mutter and gnome-shell:

Mutter:

* Fix xdg-output v3 implementationo

Causes clients implementing xdg_output v3 not to see the xdg_output
properties, as the event marking completion was never sent. Depending on
the client, this this can cause them to break terribly.

URL: https://gitlab.gnome.org/GNOME/mutter/merge_requests/771
Risk: Low to none


* Fix mutter detecting monitors after docking

Mutter didn't detect monitors connectod to docking station when docking.
Makes docking station more or less useless.

URL: https://gitlab.gnome.org/GNOME/mutter/merge_requests/743
Risk: Low


* Don't abort on some Proton games

There is a race condition reliably triggered by some Proton games
causing mutter to hit an assert. The change itself more or less
reinstates various object handling that were present in 3.32 and
erroneously removed during the 3.34 cycle.

URL: https://gitlab.gnome.org/GNOME/mutter/merge_requests/773
Risk: Low


GNOME Shell:

* Handle startup/shutdown of misc X11 services

With Xwayland on demand, various services needs to be restarted to deal
with the presence or lack of an X11 server. While the feature itself is
experimental and turned off by default, it is an important technology
preview and without said service management, the paper cuts fairly deep.

URL: https://gitlab.gnome.org/GNOME/gnome-shell/merge_requests/680
Risk: Low


Jonas