Turning off captured monitor breaks portal

[BrodieRobertson]

If you're capturing a monitor with a portal (for example with OBS), and you for whatever reason turn the monitor off the capture freezes inside OBS (this is expected) but when you turn the monitor back on and try to recapture the screen the capture fails and the portal must be restarted. If you're streaming with OBS this also means having to restart OBS

[ids1024]

It seems cosmic-comp doesn't send ready or failed in response to the capture that happens when the screen is off. Nor does it send stopped to the session. So that's something that will need to be fixed. The Pipewire thread keeps waiting on a response to the capture that it doesn't receive.

Though it's odd that this also prevents a future capture. It seems it does start a new screencopy thread, which creates a Pipewire stream, but for some reason it doesn't negotiate SPA_PARAM_format and doesn't actually start capturing frames...