Logged out warnings:

- Replace the Close button with an always visible "X" icon in the top/right corner.
- Check if the user is still logged in every 3 min. by default.
- Add 'wp_auth_check_interval' filter so the interval can be set from PHP.
See #23295.

git-svn-id: https://develop.svn.wordpress.org/trunk@24695 602fd350-edb4-49c9-b593-d223f7449a82

wp-includes/script-loader.php

@@ -113,6 +113,7 @@ function wp_default_scripts( &$scripts ) {
 	$scripts->add( 'wp-auth-check', "/wp-includes/js/wp-auth-check$suffix.js", array('heartbeat'), false, 1 );
 	did_action( 'init' ) && $scripts->localize( 'wp-auth-check', 'authcheckL10n', array(
 		'beforeunload' => __('Your session has expired. You can log in again from this page or go to the login page.'),
+		'interval' => apply_filters( 'wp_auth_check_interval', 3 * MINUTE_IN_SECONDS ),
 	) );
 
 	$scripts->add( 'wp-lists', "/wp-includes/js/wp-lists$suffix.js", array( 'wp-ajax-response', 'jquery-color' ), false, 1 );