I found the code used. It is in the accountsservices package, not gdm as
expected.
There is a list of excluded users and any users with a shell that has
a basename of false or "nologin" are also excepted.
The list of excluded users is currently:
bin, root, daemon, adm, lp, sync, shutdown, halt, mail, news, uucp, operator,
nobody, nobody4, noaccess, postgres, pvm, rpm, nfsnobody, pcap
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