Incorrect "cannot re-join empty room" errors

It appears element-ios gives errors about rejoining empty rooms, for rooms which aren't empty, and you aren't rejoining:


This was a thing that got fixed in matrix-react-sdk in https://github.com/matrix-org/matrix-react-sdk/commit/42de77e588b8bd1c854baf0313b4aaace70a4158, but it looks like that fix hasn't made it to iOS.

Start by reviewing the referenced matrix-react-sdk commit and tracing the corresponding rejoin error handling in element-ios. Compare the conditions that produce the “cannot re-join empty room” message, then verify that the message is no longer shown for non-empty rooms or when the user is not rejoining.

Written by the indexing model from the issue text.