[Dovecot] how to store flags \Seen into read-only mailbox?

[seriv at parkheights.dyndns.org]

I've found workaround, installed dovecot-1.0.12, and now \Seen flags is storing.
Rawlogs are attached.
Recent versions of 1.0 and 1.1 branch are broken in this aspect, I have not tried branch 1.2 for this task.

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bash-3.00# cat 20080725-140729-13208.in
[skip]
4 UID fetch 1:* (FLAGS)
5 IDLE
DONE
6 uid store 1:9,11 +Flags (\Seen)
7 IDLE
DONE
8 close
9 logout
bash-3.00# cat 20080725-140729-13208.out
* OK [RAWLOG TIMESTAMP] 2008-07-25 14:07:29
* FLAGS (\Answered \Flagged \Deleted \Seen \Draft unknown-0)
* OK [PERMANENTFLAGS ()] Read-only mailbox.
* 11 EXISTS
* 0 RECENT
* OK [UNSEEN 1] First unseen.
* OK [UIDVALIDITY 1216906855] UIDs valid
* OK [UIDNEXT 12] Predicted next UID
3 OK [READ-ONLY] Select completed.
* 1 FETCH (FLAGS () UID 1)
* 2 FETCH (FLAGS () UID 2)
* 3 FETCH (FLAGS (unknown-0) UID 3)
* 4 FETCH (FLAGS () UID 4)
* 5 FETCH (FLAGS () UID 5)
* 6 FETCH (FLAGS () UID 6)
* 7 FETCH (FLAGS () UID 7)
* 8 FETCH (FLAGS () UID 8)
* 9 FETCH (FLAGS () UID 9)
* 10 FETCH (FLAGS (\Seen) UID 10)
* 11 FETCH (FLAGS () UID 11)
4 OK Fetch completed.
+ idling
5 OK Idle completed.
* 1 FETCH (UID 1 FLAGS (\Seen))
* 2 FETCH (UID 2 FLAGS (\Seen))
* 3 FETCH (UID 3 FLAGS (\Seen unknown-0))
* 4 FETCH (UID 4 FLAGS (\Seen))
* 5 FETCH (UID 5 FLAGS (\Seen))
* 6 FETCH (UID 6 FLAGS (\Seen))
* 7 FETCH (UID 7 FLAGS (\Seen))
* 8 FETCH (UID 8 FLAGS (\Seen))
* 9 FETCH (UID 9 FLAGS (\Seen))
* 11 FETCH (UID 11 FLAGS (\Seen))
6 OK Store completed.
+ idling
7 OK Idle completed.
8 OK Close completed.
* BYE Logging out
9 OK Logout completed.
---

-- 
  Sergey Ivanov.