Comment 4 for bug 1655795

I remembered that gtk-vnc doesn't have listen support, so it's a no go for now.

Main problem for now is the issue that Alkis opened on tigervnc upstream, but I don't think we'll get a fix soon enough there.

Opening multiple listening viewers (one per x11vnc connection) could be a solution, but I'd say we can just go with ssvncviewer which supports listening for multiple connections in one process.

Regarding "the first monitor/assist work fine, but subsequent attempts require exiting the epoptes gui.", this is mostly on our end and it's due to not waiting for the exit status of the vncviewer process in python, which makes it a zombie, and since xtigervncviewer -listen exits after the first connection is gone, we are left with a zombie process right after the first connection. Fix for that is trivial and will be pushed soon.