So it seems I screwed things a bit when I added

rpc SetAppOnOutput(AppOnOutputRequest)                  returns (AppOnOutputResponse) {}

and I need to make it to a stream AppOnOutputResponse as in

rpc SetAppOnOutput(AppOnOutputRequest)                  returns (stream AppOnOutputResponse) {}

This is an async event, so I can only send it when it comes from the compositor it needs to be a subscriber.

Where exactly is this used? Currently, nowhere, but an usage for it might be homescreen or other flutter-auto/chromium/wam for getting the output events, need to correctly set-up app on different outputs.

I'm under the impression that this might break backwards compat, as just modifying AppOnOutputResponse with args is not the same as using stream.