Fix dashboard_incoming_links_feed

<?php
/*
Plugin Name: Fix dashboard_incoming_links_feed
Plugin URI: http://core.trac.wordpress.org/ticket/20379
Description: Fixes an issue updating the home URL's in Dashboard/Settings/General, in WP 3.3.1 and other versions. Note changes do not take effect until you return to Dashboard. To verify, look at the the db table 'wp_options' row with option_name='dashboard_widget_options'.
Version: 1.0
Author: kitchin
License: FreeBSD
*/

if ( ! function_exists('fix_dashboard_incoming_links_feed') ) {

    // This filter is called when the adminr changes 'home' in the Dashboard, and on initial WP setup.

    add_filter( 'dashboard_incoming_links_feed', 'fix_dashboard_incoming_links_feed' );

    function fix_dashboard_incoming_links_feed( $url ) {

        // Copy code from wp-admin/includes/dashboard.php :

        $widget_options = get_option( 'dashboard_widget_options' );
        if ( !$widget_options || !is_array($widget_options) )
            $widget_options = array();

        $num_items = isset($widget_options['dashboard_incoming_links']['items']) ? $widget_options['dashboard_incoming_links']['items'] : 10;

        // New code :

        // This value is hard-coded in wp-admin/includes/dashboard.php :
        $url_prefix = 'http://blogsearch.google.com/blogsearch_feeds?scoring=d&ie=utf-8&num=' . $num_items . '&output=rss&partner=wordpress&q=link:';

        // This is the default new url, as WP uses on initial setup :
        $url = $url_prefix . trailingslashit( get_option('home') );

        // Heuristic to override the default url if it has been modded in the db.
        // Maybe not a good idea, but here to maintain current WP behavior in that case.
        // Not tested.

        if ( isset( $widget_options['dashboard_incoming_links']['url'] ) ) {
            if (0 !== strpos($widget_options['dashboard_incoming_links']['url'], $url_prefix)) {
                $url = $widget_options['dashboard_incoming_links']['url'];
            }
        }

        // Note changes do not take effect until you return to Dashboard.
        // To verify, look at the the db table 'wp_options' row with option_name='dashboard_widget_options'.

        return $url;
    }
}

?>