private function getSelectedMappingsFromRequest(HTTPRequest $request, Project $project)
 {
     if ($this->requestIsRestore($request)) {
         return $this->mapper->getDefaultMappingsForProject($project);
     }
     $list = array();
     foreach (MediawikiUserGroupsMapper::$MEDIAWIKI_GROUPS_NAME as $mw_group_name) {
         $list[$mw_group_name] = array_filter(explode(',', $request->get('hidden_selected_' . $mw_group_name)));
     }
     return $list;
 }