admin ui prevents editing 2-character usernames

[dcnadler]

Proposed change

Change the min length of username from 3 to 2: https://github.com/jupyterhub/jupyterhub/blob/main/jsx/src/components/EditUser/EditUser.jsx#L130

Our organization uses last name as usernames and people with two-letter last names cannot be added through the front-end.

Alternative options

None

Who would use this feature?

Those who want 2-letter usernames

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[minrk]

Just to be clear, did you only encounter this issue editing users via the admin UI? JupyterHub doesn't prohibit 2-character usernames in general.

[minrk]

The client-side validation should all be removed, I think #4016 finishes that.

[dcnadler]

Just to be clear, did you only encounter this issue editing users via the admin UI? JupyterHub doesn't prohibit 2-character usernames in general.

Correct. We can add users with 2-letter usernames fine with jupyterhub_config.py, it was just the front-end that prevented it.

Thanks for the fix!