id	summary	reporter	owner	description	type	status	priority	milestone	component	version	severity	resolution	keywords	cc
13162	Username sanitization silently remove diacritic & such	Jbb	sivel	"As per #13159

Manually adding user (backend User->Add new) allow for any username (for example, '''Dédé''') without any error. But WP silently sanitize the username ('''Dd''' in my example), so the admin has no idea something went wrong.

Also, Self registration indicate a “Invalid username” error, without any more explanation. Some textual explanation about what's ok and what not might be helpful.

See r14264 & r14265 for consistency.
"	defect (bug)	closed	normal	3.0	Validation		normal	fixed	has-patch