Change media devices mid-call

[robertlong]

Companion to matrix-org/matrix-js-sdk#1977 in which we add support for changing media devices mid-call. In the matrix-react-sdk this requires a one line change which updates the stream in the VideoFeed when it changes.

---

Here's what your changelog entry will look like:

✨ Features

• Change media devices mid-call (#6935). Contributed by @robertlong.

Preview: https://6165fcc949fb1e009f8278fd--matrix-react-sdk.netlify.app
⚠️ Do you trust the author of this PR? Maybe this build will steal your keys or give you malware. Exercise caution. Use test accounts.

[SimonBrandner]

Some methods of MediaHandler are now async, could we please also update the ones in MediaDeviceHandler to be async too?

[turt2live]

this lgtm

@SimonBrandner - updating the class to be async feels like a different PR's concern? If we're not using the async functionality in the react-sdk, it's fine to keep it sync.

[SimonBrandner]

this lgtm

@SimonBrandner - updating the class to be async feels like a different PR's concern? If we're not using the async functionality in the react-sdk, it's fine to keep it sync.

I guess so, though it would be nice to do it before we (or I at least) forget they're async :D

[turt2live]

Your IDE settings may need tuning so it can warn you.

[SimonBrandner]

Your IDE settings may need tuning so it can warn you.

True though the react-sdk class has wrapper functions which are not async which the IDE won't help with

[turt2live]

@robertlong fyi we don't merge people's changes for them if they have commit access to the repo, just in case there's sensitivity to things landing. This appears to be open still - was it intending to be merged?

[SimonBrandner]

@robertlong fyi we don't merge people's changes for them if they have commit access to the repo, just in case there's sensitivity to things landing. This appears to be open still - was it intending to be merged?

IIRC, @robertlong has mentioned there were some unresolved concerns with this. Though I would appreciate this moving forward as #7173 is blocked on this