How can an X11 tell it's running in XWayland?

[Olivier Fourdan]

Hi

Some apps should be run in a plain X11 session but not in XWayland (e.g. an
X11 screensaver makes no sense in Wayland/XWayland).

There is one atom WL_SURFACE_ID that should be created only on/by XWayland
(for obvious reasons), is that reliable enough to determine we're running
on XWayland?

Thanks,
Olivier
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