ExecStopPost= is executed even if ExecCondition= fails. As such, we need
to add a guard as we would otherwise clear environment variables on X11
sessions (rendering them utterly useless).
https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/1418
SuccessExitStatus=1
# unset some environment variables that were set by the shell and won't work now that the shell is gone
-ExecStopPost=-systemctl --user unset-environment GNOME_SETUP_DISPLAY WAYLAND_DISPLAY DISPLAY XAUTHORITY
+ExecStopPost=-/bin/sh -c 'test "$SERVICE_RESULT" != "exec-condition" && systemctl --user unset-environment GNOME_SETUP_DISPLAY WAYLAND_DISPLAY DISPLAY XAUTHORITY'
# On wayland we cannot restart
Restart=no