Treat DM rooms with bridge bots as People using MSC4171 service member functionality

[frebib]

Your use case

What would you like to do?

Have DM rooms (2 users + a bridge bot) show up in the People filter just like they do in other Matrix clients
using MSC4171

Why would you like to do it?

Because bridged users are people too. It provides a consistent (and more importantly) intuitive experience

How would you like to achieve it?

Adjust the isDm() check here:

element-x-android/libraries/matrix/api/src/main/kotlin/io/element/android/libraries/matrix/api/room/RoomIsDmCheck.kt

Line 18 in b2a9ebb

return isDirect && activeMembersCount <= 2

to use the recently implemented service_members functionality in Rust SDK added in matrix-org/matrix-rust-sdk#4335. Whilst matrix-org/matrix-rust-sdk#4335 fixes the room name for bridged rooms, it doesn't expose the required information through the SDK FFI layer for the app to know which users in a room are service members.

I'm asking here if this seems like a reasonable thing to do given how Element wants to frame DM chats, and whether approach is considered acceptable. I'm happy to attempt some of the implementation for this

Have you considered any alternatives?

I have a hacky patch that achieves roughly the same thing, but it's awful and not a good way to solve this frebib@e5a5acc

Additional context

No response

Are you willing to provide a PR?

Yes

[frebib]

It also just occurred to me that perhaps this information might also be used to render something in the room member list as per the MSC

Clients may include some special label for service members in the member list and/or other places in the room to make it clearer why they're not included in the room name.