Edit in a federated conversation moves conversation to the top again

[SystemKeeper]

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Steps to reproduce

1. A conversation hosted on server "S" adds a user from server "C" as a federated user
2. Messages are exchanged and the conversation is not the top of the list anymore
3. A user from server "S" edits a message

Expected behaviour

The conversation should not be moved to the top of the conversation list again (this seems to be the case for non-federated conversations)

Actual behaviour

The conversation is moved to the top again, although it is still marked as read.
Not sure if we need to take into account if it was the last message because of soft-updating, but in the observed case it was not the last message.

Talk app

Talk app version: 19.0.0