archive namespace reports mdbox_deleted: same as mdbox: is that ok?

[Marc]

New test

step 1. 
=======
initial state inbox and deleted

[@ testtest]# doveadm -o mail_location=mdbox:/home/popusers/testtest/mdbox:INDEX=/home/popindex/testtest/index mailbox status -u testtest 'messages vsize' '*'
Sent messages=17 vsize=7473
Drafts messages=6 vsize=67170
INBOX/test2 messages=198 vsize=12552420
Junk messages=2 vsize=1969
Deleted Messages messages=0 vsize=0
Trash messages=47 vsize=769284
INBOX messages=1117 vsize=207623033

[@ testtest]# doveadm -o mail_location=mdbox_deleted:/home/popusers/testtest/mdbox:INDEX=/home/popindex/testtest/index mailbox status -u testtest 'messages vsize' '*'
Sent messages=0 vsize=0
Drafts messages=0 vsize=0
INBOX/test2 messages=0 vsize=0
Junk messages=0 vsize=0
Deleted Messages messages=0 vsize=0
Trash messages=0 vsize=0
INBOX messages=2 vsize=89284

step 2.
=======
check if we have messages indeed stored

[@ testtest]# grep 45765765870 /home/popusers/testtest/mdbox/storage/*
/home/popusers/testtest/mdbox/storage/m.893:Subject: New file uploaded 45765765870


step 3. 
=======
delete 5 messages including the one having subject '45765765870' from inbox/test2 mailbox with thunderbird shift+delete, restart thunderbird (otherwise nothing happens on server)

step 4. 
=======
verify if messages are indeed deleted, looks like ok, indeed 5 fewer messages.

[@ testtest]# doveadm -o mail_location=mdbox:/home/popusers/testtest/mdbox:INDEX=/home/popindex/testtest/index mailbox status -u testtest 'messages vsize' '*'
Sent messages=17 vsize=7473
Drafts messages=6 vsize=67170
INBOX/test2 messages=193 vsize=12296609
Junk messages=2 vsize=1969
Deleted Messages messages=0 vsize=0
Trash messages=47 vsize=769284
INBOX messages=1117 vsize=207623033

step 5.
=======
verify refcount=0 messages in folders, not ok, INBOX/test2 should have 5

[@ testtest]# doveadm -o mail_location=mdbox_deleted:/home/popusers/testtest/mdbox:INDEX=/home/popindex/testtest/index mailbox status -u testtest 'messages vsize' '*'
Sent messages=0 vsize=0
Drafts messages=0 vsize=0
INBOX/test2 messages=0 vsize=0
Junk messages=0 vsize=0
Deleted Messages messages=0 vsize=0
Deleted Messages/test messages=0 vsize=0
Trash messages=0 vsize=0
INBOX messages=3 vsize=90243