fix retrieval of user groups

apps/user_ldap/lib/access.php

@@ -149,7 +149,11 @@ class Access extends LDAPUtility implements user\IUserTools {
 		$this->abandonPagedSearch();
 		// openLDAP requires that we init a new Paged Search. Not needed by AD,
 		// but does not hurt either.
-		$this->initPagedSearch($filter, array($dn), array($attr), 1, 0);
+		$pagingSize = intval($this->connection->ldapPagingSize);
+		// 0 won't result in replies, small numbers may leave out groups
+		// (cf. #12306), 500 is default for paging and should work everywhere.
+		$maxResults = $pagingSize < 20 ? $pagingSize : 500;
+		$this->initPagedSearch($filter, array($dn), array($attr), $maxResults, 0);
 		$dn = $this->DNasBaseParameter($dn);
 		$rr = @$this->ldap->read($cr, $dn, $filter, array($attr));
 		if(!$this->ldap->isResource($rr)) {

apps/user_ldap/lib/connection.php

@@ -26,11 +26,13 @@ namespace OCA\user_ldap\lib;
 //magic properties (incomplete)
 /**
  * responsible for LDAP connections in context with the provided configuration
+ *
  * @property string ldapUserFilter
  * @property string ldapUserDisplayName
  * @property boolean hasPagedResultSupport
  * @property string[] ldapBaseUsers
-*/
+ * @property int|string ldapPagingSize holds an integer
+ */
 class Connection extends LDAPUtility {
 	private $ldapConnectionRes = null;
 	private $configPrefix;