"maildir_empty_new =?utf-8?Q?=3D_?=yes" not working

[Nikola Derikonjic]

I need for my dovecot-uidlist to be updated with next id when new email arrives (moved from new/ to cur/). 
This only happens now when I check for new email with my client.
Setting maildir_empty_new = yes is not working. Do I have to uncomment something else as well maybe?

I want to do some proemial pipe lets say for 10 emails. All of them will have same UID since dovecot-uidlist is not updated. 
I am suing 2.2.13 dovecot on Gentoo 64bit.

This is my dovecot -n:

# 2.2.13: /etc/dovecot/dovecot.conf
# OS: Linux 3.16.5-gentoo x86_64 Gentoo Base System release 2.2
auth_mechanisms = plain login digest-md5
first_valid_gid = 500
last_valid_gid = 2000
last_valid_uid = 2000
login_greeting = Santa server is ready.
mail_gid = vmail
mail_location = /var/vmail/%d/%n/:INDEX=/var/vmail/%d/%n/indexes
mail_uid = vmail
maildir_empty_new = yes
managesieve_notify_capability = mailto
managesieve_sieve_capability = fileinto reject envelope encoded-character vacation subaddress comparator-i;ascii-numeric relational regex imap4flags copy include variables body enotify environment mailbox date ihave duplicate
namespace inbox {
  inbox = yes
  location =
  mailbox Drafts {
    special_use = \Drafts
  }
  mailbox Junk {
    special_use = \Junk
  }
  mailbox Sent {
    special_use = \Sent
  }
  mailbox "Sent Messages" {
    special_use = \Sent
  }
  mailbox Trash {
    special_use = \Trash
  }
  prefix =
}
passdb {
  args = /etc/dovecot/dovecot-sql.conf.ext
  driver = sql
}
plugin {
  sieve = ~/.dovecot.sieve
  sieve_dir = ~/sieve
}
service auth-worker {
  user = vmail
}
service auth {
  unix_listener /var/spool/postfix/private/auth {
    group = postfix
    mode = 0666
    user = postfix
  }
  unix_listener auth-userdb {
    group = vmail
    mode = 0666
    user = vmail
  }
}
service lmtp {
  unix_listener /var/spool/postfix/private/dovecot-lmtp {
    group = postfix
    mode = 0666
    user = postfix
  }
}
ssl_ca = </etc/ssl/dovecot/server.in.crt
ssl_cert = </etc/ssl/dovecot/server.csr.rapid
ssl_key = </etc/ssl/dovecot/server.key.rapid
ssl_key_password = notshown
userdb {
  args = /etc/dovecot/dovecot-sql.conf.ext
  driver = sql
}

-- 
Nikola Derikonjic
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