Admin username diacritics silently stripped at install

[Jbb]

1. Fresh install of WP trunk
2. For the admin username, enter some diacritic. For example, Jérémie
3. All goes well it seems
4. Can't log in with that user

But in the users SQL table, the login name registered is: Jrmie

Login name should accept most unicode glyphs, especially well unique and used diacritic. A help button at registration should explain the rules of login taxonomy (what's allowed, what's not). And it should never ever alter the login in any way without warning the user.

[Jbb]

Thanks for the various keywords and fields update. It's my first involvement, I didn't want to assign wrong values.

I've done further testing. It's not only at install, even when manually adding a user through WP backend (Users->Add New) it's the same thing (silently strip diacritic).

[nacin]

We have very little poka yoke in the install form. I think for now we should just make sure they know we're going to sanitize their username to a certain set of characters. Could simply be some text we add.

[nacin]

(In [14264]) Show the sanitized username on install.php completion page. Also add some help text. see #13159.

[nacin]

(In [14265]) Poka yoke for username sanitization during install. see #13159.

[nacin]

I think this one is good.

[Jbb]

What about self registration, or manually adding user? Shouldn't the warnings & explanations be there too?

Also, in your textual description of what's OK as a login, maybe you could say if login are case sensitive or not?

Just my 2 cents.

[nacin]

They're insensitive, so I don't think we need to specify that. (If they were case-sensitive, then I'd include that.)

We can handle the other aspect in another ticket (which you're more than welcome to open). I think the install aspect was most important, especially since we just added that in 3.0 and did not display the sanitized username once WP was installed.

[Jbb]

Done, thanks a lot.