[RFE] Xspice listening on unix socket

Hi,

would it be possible to have Xspice listening on unix socket? The idea is to have SPICE alternative to x11vnc which is able to listen on unix socket and spawn Xdummy/Xvfb...

So, one could do something like this with Xspice:

ssh -oPermitLocalCommand=yes \
  -oLocalCommand="(sleep 1; remote-viewer spice://localhost:5900 >/dev/null 2>&1 )&" \
  -L 5900:/home/jirib/xspice.sock \
  192.168.1.7 Xorg -noreset -config spiceqxl.xorg.conf :3.0```

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