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9d6e68b45f
InputOnly windows aren't relevant here.
E.g. mutter-x11-frames uses GTK4, which creates a 1x1 InputOnly child
window, which previously prevented this code from working as intended.
v2: (Olivier Fourdan)
* Rename output_child -> input_output_child.
* Add comment in get_single_input_output_child explaining why we return
NULL if input_output_child is already non-NULL.
Part-of: <https://gitlab.freedesktop.org/xorg/xserver/-/merge_requests/2069>
(cherry picked from commit 6f31791945)