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Olivier Fourdan authored
When xfwm4 needs to kill an unresponsive client, it will use the its PID is known. However, the _NET_WM_PID as defined in the extended window manager hint mechanism is unreliable when the client runs within a sandbox, as it is the client itself who sets that property using its own view of the PID. The Xserver can provide a more accurate value of the client PID using the XRes X11 extension, so use that protocol if available. Signed-off-by: Olivier Fourdan <fourdan@xfce.org>
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