Jonas Ådahl b31a639378 backend: Add 'prepare-shutdown' signal
This will be used to avoid doing various work when we're shutting down,
e.g. react to changes triggering monitor reconfigurations.

Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1698>
2021-03-12 15:09:45 +00:00
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