wp_login_form: default for redirect leads to 404 on site in sub-folders

[esmi]

When using wp_login_form in a site in a sub-folder (eg. /wordpress), the default redirect parameter (site_url( $_SERVERREQUEST_URI )) causes the redirect to duplicate the sub-folder in the url eg: ​http://example.com/wordpress/wordpress/

Replicated on 3.1.1 and 3.2 bleeding on 2 separate servers.

[kawauso]

$_SERVER['HTTP_HOST'] . $_SERVER['REQUEST_URI']

[nacin]

<input type="hidden" name="redirect_to" value="' . esc_attr( $args['redirect'] ) . '" />

Thinking that should be esc_url().

Or, if it should remain esc_attr() (and I don't think it should), then this patch should esc_url_raw() what we build from $_SERVER.

[nacin]

In [19032]:

Fix the current page default redirect in wp_login_form(). props kawauso, see #17243.

[nacin]

In [19033]:

Use esc_url() rather than esc_attr() on a redirect-to URL. fixes #17243.