`UID SEARCH UNSEEN` returns no result

[Zeus Panchenko]

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I was reported that search by unseen messages doesn't work

after some investigation I confirm, `UID SEARCH UNSEEN` returns no result

though, search by other parameters works

here is transcript to reproduce that

- ---[ imap4d v.3.10 session quotation start 
]-------------------------------------------
* OK IMAP4rev1
A0005 LOGIN user@foo.bar "secretpass"
A0005 OK LOGIN Completed

A0006 STATUS INBOX (MESSAGES UNSEEN)
* STATUS INBOX (MESSAGES 53 UNSEEN 38)
A0006 OK STATUS Completed

A0007 SELECT INBOX
* 53 EXISTS
* 0 RECENT
* OK [UIDVALIDITY 1604351724] UID valididy status
* OK [UIDNEXT 54] Predicted next uid
* FLAGS (\Answered \Flagged \Deleted \Seen \Draft)
* OK [PERMANENTFLAGS (\Answered \Flagged \Deleted \Seen \Draft)] Permanent flags
A0007 OK [READ-WRITE] SELECT Completed

A0008 UID SEARCH UNSEEN
* SEARCH
A0008 OK UID SEARCH Completed

A0009 UID SEARCH UNANSWERED
* SEARCH 1 2 3 4 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 
28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53
A0009 OK UID SEARCH Completed

A0010 UID SEARCH FLAGGED
* SEARCH
A0010 OK UID SEARCH Completed

A0011 UID SEARCH NOT HEADER X-PRIORITY 1 NOT HEADER X-PRIORITY 2 NOT HEADER 
X-PRIORITY 4 NOT HEADER X-PRIORITY 5
* SEARCH 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 
27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53
A0011 OK UID SEARCH Completed

A0012 UID SEARCH OR OR OR HEADER Content-Type application/ HEADER Content-Type 
multipart/m HEADER Content-Type multipart/signed HEADER Content-Type 
multipart/report
* SEARCH 1 2 3 4 5 6 7 8 9 24
A0012 OK UID SEARCH Completed

A0013 LOGOUT
* BYE Session terminating.
A0013 OK LOGOUT Completed
- ---[ imap4d v.3.10 session quotation end   
]-------------------------------------------

- -- 
Zeus V. Panchenko                               jid:zeus@im.ibs.dn.ua
IT Dpt., I.B.S. LLC                                       GMT+2 (EET)
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