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As per the Extended Window Manager Hints standard version 1.3 [1] an override-redirect window can set a transient-for window per compositing and app-matching purposes. So just read the WM_TRASIENT_FOR property also for such windows, adapting the error in case they are transient for another O-R window and adding a test to check such case. [1] https://standards.freedesktop.org/wm-spec/wm-spec-latest.html#idm140200472512128 https://gitlab.gnome.org/GNOME/mutter/merge_requests/920