Screen sharing got stuck with stream on still frame

[dbkr]

Steps to reproduce

Florian started screen sharing but then wanted to share a different screen. He stopped, but then on clicking the screenshare button again, it didn't prompt for which window and instead resumed the screen share with a static frame.

Outcome

What did you expect?

What happened instead?

Operating system

No response

Browser information

Firefox

URL for webapp

No response

Will you send logs?

Yes

[dbkr]

Just ran into this while fixing a different bug - turns out the cause is that we don't terminate screenshare feeds for individual calls when a member leaves.

Repro steps:

1. Join group call with at least 3 participants
2. Start screenshare from one
3. One of the other participants leaves
4. Stop screensharing
5. Press screenshare button again

Same screenshare feed appears rather than it re-prompting you for what you want to share (for me it was still a live view of that window rather than a still frame).