https://www.systutorials.com/docs/linux/man/docs/linux/man/docs/linux/man/docs/linux/man/docs/linux/man/3-xcb_unmap_subwindows/
xcb_unmap_subwindows - Linux Manuals (3)
RETURN VALUE Returns an xcb_void_cookie_t. Errors (if any) have to be handled in the event loop. If you want to handle errors directly with xcb_request_check...
linux manualsxcbunmapsubwindows