redirect_to within wp-login.php breaks with an authentication failure

[oaoao]

When submitting from an external form to wp-login.php:

<form action="/wp-login.php?redirect_to=%2F" method="post">

everything operates normally if the user is authenticated on the first try. He is properly redirected to the redirect_to URL, which is "/" in this case.

However, if the login attempt failed on the first try, and a user is passed to the Wordpress login page, redirect_to seems to be lost in the new form, and the user will be redirected to his profile page.

[gerbennn]

I'm unable to replicate this bug. ENV:2.1.3
After the first request the form gets a hidden input with the value.

<input type="hidden" name="redirect_to" value="/" />

It's carryed on to every time the page loads

[ryan]

(In [5487]) Fix tinymce colorpicker. Props azaozz. fixes #4188 for 2.3

[ryan]

Oops, committed to wrong bug. Ignore that commit message.

[markjaquith]

Cannot recreate, either with "Subscriber" or "Admin" account. Both types carry the redirect_to value on invalid logins and redirect to that URL after a successful login (following an indefinitely long chain of unsuccessful logins).