Truncate very long participant lists?

[nesium]

In some extreme cases you have to scroll a lot to reach the controls surrounding the participant list.

A solution which could play into 4. here would be to show a truncated list of participants, say 10 with a "Show more" button. In the core we'd then only look up the names of the 10 visible (sorting TBD) participants. If you click "Show more" you could see all participants in a popup. The core could then resolve the remaining names and fire update events incrementally.