Cast to TV
When used on my Linux phone (e.g. Pinephone), I would like to cast videos to my TV but keep the touch controls on my phone. So extended desktop doesn't work without a mouse and mirror is also suboptimal as it casts the same aspect ratio and also shows the controls to the user. I imagine a cast button (similar to the YouTube on Android app) which would only cast the video to the TV in addition to having the interface as is one the phone. So I have a preview on the phone, all controls and the other people only see the video itself. It might be possible to re-use the cast functionality from gnome-network-displays#275.