final Long changedSince = fetch.getChangedSince();
final MessageManager mailbox = getSelectedMailbox(session);
if (mailbox == null) {
throw new MailboxException("Session not in SELECTED state");
}
final boolean vanished = fetch.getVanished();
if (vanished && !EnableProcessor.getEnabledCapabilities(session).contains(ImapConstants.SUPPORTS_QRESYNC)) {
taggedBad(command, tag, responder, HumanReadableText.QRESYNC_NOT_ENABLED);