updated when syncing the mailbox. This was the reason for Bob Bell's
  segfault when manipulating mailboxes with multiple simultaneous
  clients.
* makes a small adjustment for Sam's weird Courier server, which
  returns an OK FETCH completed response even when FETCH fails. I
  should probably report that behaviour to him as a bug, though.
* renames IMAP_REOPEN_PENDING to IMAP_EXPUNGE_PENDING
* gets rid of the _("Closing mailbox...") message, which was obscuring
  the status updates.
* clears some spurious mutt_clear_error calls in imap_cmd_finish.
* makes socket reads and writes check that they have an open
  connection. Shouldn't be necessary (and such calls are logged), but
  can happen currently.
* Some SASL vs regular authenticator tweaks in the imap Makefile.

(From Brendan Cully.)