Equal sign in URL causes problems on site name change

[anonymized_7341632]

Steps to reproduce the problem:
Create a WP site at a url like: ​http://localhost/~Fede/=test/3.1/
Go here to change the site name: ​http://localhost/~Fede/=test/3.1/wp-admin/options-general.php

The name will be changed, but you will be redirected to a wrong URL: ​http://localhost/~Fede/=test%2F3.1%2Fwp-admin%2Foptions-general.php&settings-updated=true

I assume the problem is caused by the = sign, as other websites under ​http://localhost/~Fede/ don't have the same problem.

I tried it on 3.0.4 and 3.1-RC1

[anonymized_7341632]

16040.patch solved the problem on 3.0.4, 3.1RC1 and 3.1RC2, HOWEVER:

• the logout link in the admin is changed to: ​http://_wpnonce=9b5ccb0215
• when trying to change the site's urlS (which were also affected by the initial problem) you get redirected to "​http://reauth%3D1", and to the "home" link is not updated in the database.

[nacin]

It's a reserved character, so this is too hard to tell whether the browser is just silently decoding it on display for you. I'm not a fan of spending any time trying to fix this.

[westi]

Reproduced in trunk.

I agree that this is too edge to worry about now.