This behavior is hard to test as it's mostly fixing a race condition: User A sends a message at the same time than User B, which as a result doesn't cause a scroll for the second message and we don't update last read unless we do a small up and down scroll.
`updateLastRead` is debounced so it has no direct consequences to call it slightly more often than what should ideally be needed.
Joffrey JAFFEUX
aa8eff5e16