Kerberos accounts added through the Settings -> Online Accounts UI are shown as primary@REALM (eg., dray@REDHAT.COM). However, those that are added via kinit (ie. temporary accounts) are only shown as REALM (eg., REDHAT.COM).

This is inconsistent in itself.

Moreover, for other providers (like Google, IMAP/SMTP, etc.) we try to show the full user facing (and user readable) string as much as possible. Essentially, this is the string that the user could be expected to type into a configuration dialog. eg., foo@bar.com that they use to log into Facebook, but not the human unreadable identifier that Facebook's API uses.

I think the original idea behind only using REALM was to avoid showing a longer string when there was only one account. However, we never did that for persistent accounts, and as I said, we usually show foo.bar@gmail.com, not gmail.com for the other types of accounts that we have.

Let's just use primary@REALM.