- Added option imap_force_lsub for some buggy LIST-EXTENDED implementations (#1486225)

config/main.inc.php.dist

@@ -84,6 +84,12 @@ $rcmail_config['imap_delimiter'] = null;
 // after login. Set to True if you've got this case.
 $rcmail_config['imap_force_caps'] = false;
 
+// By default list of subscribed folders is determined using LIST-EXTENDED
+// extension if available. Some servers (dovecot 1.x) returns wrong results
+// for shared namespaces in this case. http://trac.roundcube.net/ticket/1486225
+// Enable this option to force LSUB command usage instead.
+$rcmail_config['imap_force_lsub'] = false;
+
 // IMAP connection timeout, in seconds. Default: 0 (no limit)
 $rcmail_config['imap_timeout'] = 0;
 

program/include/rcube_imap.php

@@ -2827,7 +2827,9 @@ class rcube_imap
         }
         else {
             // Server supports LIST-EXTENDED, we can use selection options
-            if ($this->get_capability('LIST-EXTENDED')) {
+            $config = rcmail::get_instance()->config;
+            // #1486225: Some dovecot versions returns wrong result using LIST-EXTENDED
+            if (!$config->get('imap_force_lsub') && $this->get_capability('LIST-EXTENDED')) {
                 // This will also set mailbox options, LSUB doesn't do that
                 $a_folders = $this->conn->listMailboxes($this->mod_mailbox($root), $filter,
                     NULL, array('SUBSCRIBED'));