RFC 5465 (NOTIFY) violation: missing HIGHESTMODSEQ in initial STATUS responses

[Guilhem Moulin]

Quoting RFC 5465 (NOTIFY):

   “If the NOTIFY command enables MessageNew, MessageExpunge,
    AnnotationChange, or FlagChange notifications for a mailbox other
    than the currently selected mailbox, and the client has specified
    the STATUS indicator parameter, then the server MUST send a STATUS
    response for that mailbox before NOTIFY's tagged OK. […]
    If either AnnotationChange or FlagChange are included and
    the server also supports the CONDSTORE [RFC4551] and/or QRESYNC
    [RFC5162] extensions, the STATUS response MUST contain UIDVALIDITY
    and HIGHESTMODSEQ.” —
    https://tools.ietf.org/html/rfc5465#section-3.1

While unsolicited STATUS responses include HIGHESTMODSEQ indeed, the initial
STATUS responses (caused by the presence of the STATUS indicator) do not:

    ~$ /usr/lib/dovecot/imap
    * PREAUTH [CAPABILITY IMAP4rev1 … CONDSTORE QRESYNC … NOTIFY SPECIAL-USE] Logged in as guilhem
    a ENABLE QRESYNC
    * ENABLED QRESYNC
    a OK Enabled (0.000 secs).
    b NOTIFY SET STATUS (SUBSCRIBED (MessageNew MessageExpunge FlagChange))
    * STATUS INBOX (MESSAGES 9069 UIDNEXT 109398 UIDVALIDITY 1312585007 UNSEEN 0)
    […]
    b OK NOTIFY completed (0.008 secs).
    [time passes… a new message is delivered to INBOX]
    * STATUS INBOX (MESSAGES 9070 UIDNEXT 109399 UNSEEN 1 HIGHESTMODSEQ 22216)

This defeats the purpose of the STATUS indicator for disconnected
clients since they have to issue separate STATUS commands (or a LIST
command if LIST-{EXTENDED,STATUS} have been advertized) to find out
which mailboxes have got a new HIGHESTMODSEQ.

Cheers,
-- 
Guilhem.
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