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Revert the biggest part of https://github.com/chatmail/core/pull/6722/ in order to fix #6816. Reopens https://github.com/chatmail/core/issues/6706. Rationale for reverting instead of fixing is that it's not trivial to implement "if the chat is encrypted, can_send() returns true": When sending a message, in order to check whether to encrypt, we load all peerstates and check whether all of them can be encrypted to (`should_encrypt()`). We could do this in `can_send()`, but this would make it quite slow for groups. With multi-transport, the ways of checking whether to encrypt will be different, so in order not to do unnecessary work now, this PR just revert parts of [https://github.com/chatmail/core/pull/6722/](https://github.com/chatmail/core/pull/6817#), so that we can make things work nicely when multi-transport is merged. As a quick mitigation, we could increase the timeout from 15s to something like 1 minute or 1 day: Long enough that usually securejoin will finish before, but short enough that it's possible to send to old chats that had a failed securejoin long in the past.