If an ultimately trusted pgp certificate has a revoked userid, signed mails will display the security level 2 instead of 4.

To reproduce:

1. Create a mail with security level 4 (e.g. from edward to ted with default test certs)
2. Make sure, security level 4 is displayed in Outlook
3. Add and revoke a userid on the signing cert (e.g. to edwards cert)
4. Select the mail in Outlook -> security level 2 is displayed

gpgol.log (preview mail):