IMAP_UNREAD_MAIL should be emitted when a message SEEN flag changes
Otherwise the UI message gets weirdly out-of-date.
(from redmine: created on 2013-09-01, closed on 2013-09-02, relates #3654 (closed))
Otherwise the UI message gets weirdly out-of-date.
(from redmine: created on 2013-09-01, closed on 2013-09-02, relates #3654 (closed))