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xwayland: Start Xwayland for services and never stop on non-systemd

Benjamin Berg requested to merge benzea/xwayland-non-systemd-startup into master

I don't really like doing the sd_pid_get_user_unit thing in both places. A new MetaDisplayPolicy could work, but that requires more changes all over the place.

The (gnome-shell) handling to start the X11 related services (i.e. gsd-xsettings) requires running in a systemd managed session. If this is not the case, we must start Xwayland already for gsd-xsettings and we cannot auto-shutdown Xwayland.

As such, we get three common cases:

  • Fully working Xwayland on demand on systemd
  • gsd-xsettings starting Xwayland immediately at login time (this is currently the case for the gnome-initial-setup session)
  • Xwayland remaining dormand as nothing ever requires it (this is the case for the GDM greeter)

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