Janne Mareike Koschinski

One desired use case with this is to allow users to view and access a predecessor room they haven't been in before, and which their homeserver likely doesn't know about....

From my testing (with Element version: 1.11.8 as desktop app, with app.element.io, as well as with Element Nightly) the "fullscreen widget" button at the top right does show the call...

Related: - [MSC3856: Threads List API](https://github.com/matrix-org/matrix-spec-proposals/blob/main/proposals/3856-threads-list-api.md) - [MSC3981: /relations recursion](https://github.com/matrix-org/matrix-spec-proposals/blob/main/proposals/3981-relations-recursion.md)