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Since PIDs are inherently insecure because they are reused after a certain amount of processes was started, it's possible the client PID was spoofed by the client. So make sure users of the meta_window_get_pid() API are aware of those issues and add a note to the documentation that the PID can not be totally trusted. https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1180