I've never seen VNC clients doing that. There might well be _servers_ doing that, i.e. offering only the screen part that is used by a certain application. And RDP can do it, too. But not VNC, I think. The protocol hasn't really a notion of "windows". So unfortunately this won't fly, I guess.
But good to have this thread back in my attention focus - I need to flesh out the racing condition that brings the application to a stall or makes it break sometimes.
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