Describe group filter's name_attr in sample config; defaults to 'cn' if not specified

config/main.inc.php.dist

@@ -711,12 +711,14 @@ $rcmail_config['ldap_public']['Verisign'] = array(
       'scope'   => 'list',
       'base_dn' => 'ou=Groups,dc=mydomain,dc=com',
       'filter'  => '(|(objectclass=groupofuniquenames)(objectclass=groupofurls))',
+      'name_attr' => 'cn',
     ),
     'customers' => array(
       'name'    => 'Customers',
       'scope'   => 'sub',
       'base_dn' => 'ou=Customers,dc=mydomain,dc=com',
       'filter'  => '(objectClass=inetOrgPerson)',
+      'name_attr' => 'sn',
     ),
   ),
 );

program/lib/Roundcube/rcube_ldap.php

@@ -88,7 +88,11 @@ class rcube_ldap extends rcube_addressbook
         if (is_array($p['group_filters']) && count($p['group_filters'])) {
             $this->groups = true;
 
-            foreach ($p['group_filters'] as $group_filter) {
+            foreach ($p['group_filters'] as $k => $group_filter) {
+                // set default name attribute to cn
+                if (empty($group_filter['name_attr']) && empty($this->prop['groups']['name_attr']))
+                    $this->prop['group_filters'][$k]['name_attr'] = $group_filter['name_attr'] = 'cn';
+
                 if ($group_filter['name_attr'])
                     $fetch_attributes[] = $group_filter['name_attr'];
             }