Not sure if this is implemented or not - expose a window title set through controller interface to the client app so it can change it accorgingly (similar to spicec functionality or to its -t $title option).
this is done already via the spice-controller library. I implemented controller support in vinagre & virt-viewer. Although virt-viewer seems more promising atm, but Daniel didn't merge my changes yet. It's there, with title change support. https://gitorious.org/virt-viewer/virt-viewer-elmarco
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