Carlos Garnacho a0bdf44c2d core: Do not crash on untimely stack queries for X11 windows
Some meta_later operations may happen across XWayland being shutdown,
that trigger MetaStackTracker queries for X11 XIDs. This crashes as
the MetaX11Display is already NULL.

Return a NULL window in that case, as in "unknown stack ID".

https://gitlab.gnome.org/GNOME/mutter/merge_requests/728
2019-08-15 15:11:01 +02:00
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