Use MAIL_INDEX_SYNC_FLAG_AVOID_FLAG_UPDATES so we don't keep writing flag changes to transaction log.
Use MAIL_INDEX_SYNC_FLAG_AVOID_FLAG_UPDATES so we don't keep writing flag
changes to transaction log.

--HG--
branch : HEAD

jwm/dovecot-notmuch,jwm/dovecot-notmuch,jwm/dovecot-notmuch,jkerihuel/dovecot,jwm/dovecot-notmuch,jwm/dovecot-notmuch,jkerihuel/dovecot,jkerihuel/dovecot,jkerihuel/dovecot,jkerihuel/dovecot