Wiki groups selection does not work

Checking the code i found that group change in view redirects the page to URL containing parameter "gid", but the code in /mod/wiki/view.php line 45 actually reads the group ID from parameter "group". After little investigation seems, that this fixes the problem: --- a/mod/wiki/view.php +++ b/mod/wiki/view.php @@ -209,7 +209,7 @@ if ($id) { // Checking is there is a page with this title. If it does not exists, redirect to first page if (!$page = wiki_get_page_by_title($subwiki->id, $title)) { - $params = array('wid' => $wiki->id, 'gid' => $gid, 'uid' => $uid, 'title' => $wiki->firstpagetitle); + $params = array('wid' => $wiki->id, 'group' => $gid, 'uid' => $uid, 'title' => $wiki->firstpagetitle); $url = new moodle_url('/mod/wiki/view.php', $params); redirect($url); }   But after this code change i can't switch back to "All participants" (always the group stays selected instead)...