Carlos Garnacho authored Aug 15, 2019 and Benjamin Berg committed Aug 26, 2019

There's some changes in how this service is started:
- Instead of it being part of the gnome-session target initialization
  chain, it now depends on a new gnome-session-x11-services target.
  Initialization of this target is left up in the air here, and may
  happen during startup or at any random point during the running
  session. The same analogous behavior will be seen at shutdown.
- The Restart condition has been softened to on-abnormal, as unclean
  exits are somewhat unavoidable on Xwayland restart scenarios. Other
  crashes or abnormal signals should still be intercepted as usual,
  and lead to the fail whale.