0024896: Password managers don't work with password login page
Description
Since the username is not displayed in the new login form for password entry, the usual browsers password managers don't work properly, as it cannot associate passwords for different users.
Make the username field a locked, non-visible field, instead of type
"hidden" input. This way the password managers present in browsers can
detect the different username values and remember them separately.
The problem is that inputs with type="hidden" are ignored by these
agents.
