Olivier Fourdan 445373d028 x11: Check for XCB reply
Now that mutter can survive Xwayland vanishing in mid-flight, we need to
actually check if the Xserver reply fetched though XCB is not NULL,
otherwise we may crash, that would be a shame.

Close: https://gitlab.gnome.org/GNOME/mutter/-/issues/1638
Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1718>
2021-02-09 19:06:22 +00:00
..
2021-02-09 19:06:22 +00:00