Joining large room over federation can result in 'it is not possible to rejoin an empty room' error

[ara4n]

in practice, we should somehow be waiting (either on the client or on the server) until the room join actually successfully completes. perhaps the timeout is too small and we then retry whilst it's still joining?

[jooize]

Happened to me today. Trying to join #android:matrix.org from iOS app repeatedly fails with “It is not currently possible to re-join an empty room.”, but works first time after about 15 seconds in macOS app (Electron).

[aaronraimist]

This is probably my most frustrating issue with Riot iOS. In practice I can’t ever join a new room (even small ones) on iOS and I have to use another client to do it so I end up just making lists of rooms to join when I get back to a computer.

Related to matrix-org/synapse#1533? The code that makes this error message references the Jira which has been imported to that issue
https://github.com/matrix-org/matrix-ios-kit/blame/dbb5140be4f907f005d9da65018972675b4ca8ad/MatrixKit/Controllers/MXKRoomViewController.m#L860

[fridtjof]

This is still happening - I just left #riot-ios:matrix.org because the title/icon didn't show, and now I can't rejoin it.

[aaronraimist]

Related: element-hq/element-web#4251 element-hq/riot-android#2042