Issue: Namespace Special Post Form

If a namespace has spaces in its title, and + is used as the space character, then selecting such a namespace in the form on a Special page will result in a 'specified namespace does not exist' error.

This occurs because while $_GET and $_REQUEST are automatically urldecoded by PHP, because the browser automatically urlencodes them for being user editable in the address bar, the browser doesn't modify the $_POST data in this way. Post-data is not passed through the address bar, so it need not be urldecoded. Since the namespace was encoded in the forum using $vault->urlencode, the following condition must be considered: