protected function _vanished($modseq, Horde_Imap_Client_Ids $ids)
{
$pipeline = $this->_pipeline($this->_command('UID FETCH')->add(array(strval($ids), 'UID', new Horde_Imap_Client_Data_Format_List(array('VANISHED', 'CHANGEDSINCE', new Horde_Imap_Client_Data_Format_Number($modseq))))));
$pipeline->data['vanished'] = $this->getIdsOb();
return $this->_sendCmd($pipeline)->data['vanished'];
}