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When running non-rootless, Xwayland requires that the Wayland compositor supports the XDG-WM-Base protocol. Check for XDG-WM-Base protocol support at startup and exit cleanly if missing rather than segfaulting later in ensure_surface_for_window() while trying to use xdg_wm_base_get_xdg_surface(). Signed-off-by: Olivier Fourdan <ofourdan@redhat.com> Reviewed-by: Michel Dänzer <mdaenzer@redhat.com> Reviewed-by: Simon Ser <contact@emersion.fr>
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