bf7d5e7841
Updates the unread flag or the room in `Timeline::send_single_receipt()` and `Timeline::send_multiple_receipts()` if the room is marked as unread and the receipts are unthreaded. Updates it also in `Timeline::mark_as_read()`, even if there is no latest event ID. Signed-off-by: Kévin Commaille <zecakeh@tedomum.fr>