Do not allow OIDC user login by click "LOGIN VIA LOCAL DB"

[geoger]

1)enable OIDC auth mode,
2)click "LOGIN VIA LOCAL DB" and input OIDC user name and password.
OIDC user could login, but would wizard find that he/she is the previous OIDC user
#17096

Suggest proposal solution.
when Click "LOGIN VIA LOCAL DB", if the input user name is actually is OIDC user type, do not allow he/she to login

[sangho5o5]

Have same problem here, but "LOGIN VIA LOCAL DB" input doesn't have to be OIDC input.
Any character, even single letter, can be used to login as previous OIDC user.

Steps to reproduce in my circumstance.

1. login via OIDC provider
2. logout
3. login via local DB
4. enter any letter to login as previous OIDC user, even single letter works