shared folders not working with . separator

[Hugh Bragg]

Hi,

I've been trying this for weeks and never managed to get my mail client
to see shared folders.
Apparently imap_acl works fine as I can see these entries in the
dovecot-acl-list files and the correct entries persist in the client.
This is my first dovecot setup so I hope I've configured it right.
Everything else works beautifully, thanks.

# dovecot -n
# 2.2.21 (5345f22): /etc/dovecot/dovecot.conf
# Pigeonhole version 0.4.11 (6ddf62b87f60+)
# OS: Linux 4.3.5-300.fc23.x86_64 x86_64 Fedora release 23 (Twenty Three)
auth_mechanisms = plain login
auth_socket_path = /var/run/dovecot/auth-userdb
imap_client_workarounds = tb-extra-mailbox-sep
listen = *
log_path = /var/log/dovecot.log
mail_access_groups = mail, vmail
mail_home = /var/mail/vmail/%d/%n
mail_location = maildir:~/mail
mail_plugins = virtual, acl
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 index ihave duplicate mime foreverypart
mbox_write_locks = fcntl
namespace {
  location = virtual:/var/mail/vhosts/%d/%n/virtual
  prefix = virtual.
  separator = .
}
namespace {
  list = children
  location =
maildir:/var/mail/vhosts/%%d/%%n/mail:INDEX=/var/mail/vhosts/%d/%n/shared/%%u:CONTROL=/var/mail/vhosts/%d/%n/shared/%%u
  prefix = shared.%%u.
  separator = .
  subscriptions = yes
  type = shared
}
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
  }
  mailbox virtual/All {
    comment = All my messages
    special_use = \All
  }
  mailbox virtual/Flagged {
    comment = All my flagged messages
    special_use = \Flagged
  }
  prefix =
}
passdb {
  args = scheme=PLAIN username_format=%u /etc/dovecot/dovecot-users
  driver = passwd-file
}
plugin {
  acl = vfile
  acl_shared_dict = file:/var/mail/vhosts/shared-mailboxes.db
  sieve = ~/.dovecot.sieve
  sieve_dir = ~/sieve
  sieve_global_dir = /var/mail/vhosts/sieve-global
}
protocols = imap lmtp sieve
service auth-worker {
  user = vmail
}
service auth {
  unix_listener /var/spool/postfix/private/auth {
    group = postfix
    mode = 0660
    user = postfix
  }
  unix_listener auth-userdb {
    group = vmail
    mode = 0660
    user = vmail
  }
}
service imap-login {
  inet_listener imap {
    port = 143
  }
  inet_listener imaps {
    port = 0
    ssl = yes
  }
}
service lmtp {
  unix_listener /var/spool/postfix/private/dovecot-lmtp {
    group = postfix
    mode = 0600
    user = postfix
  }
}
service managesieve-login {
  inet_listener sieve {
    port = 4190
  }
}
service pop3-login {
  inet_listener pop3 {
    port = 0
  }
  inet_listener pop3s {
    port = 0
  }
}
ssl = required
ssl_cert = </etc/pki/dovecot/certs/dovecot.cert.pem
ssl_cipher_list = PROFILE=SYSTEM
ssl_key = </etc/pki/dovecot/private/dovecot.key.pem
userdb {
  args = uid=vmail gid=vmail home=/var/mail/vhosts/%d/%n
  driver = static
}
protocol lmtp {
  mail_plugins = virtual, acl , sieve
}
protocol lda {
  mail_plugins = virtual, acl , sieve
}
protocol imap {
  mail_plugins = virtual, acl , imap_acl
}