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Code copy from https://gitlab.gnome.org/GNOME/metacity/-/merge_requests/13/diffs The xprop `_NET_WM_PID` is set by the client side, even if the process in running in some container. But when pid_ns is unshared, the processes in side a container, will not be able to get the "right" pid of itself. The "new" XResQueryClientIds added to XRes will fix this issue by produce the pid in server side. refs: - https://gitlab.freedesktop.org/xorg/xserver/-/issues/1022#note_497597 - https://www.x.org/releases/X11R7.7/doc/resourceproto/resproto.txt close linuxdeepin/developer-center#3802