recover compose form in case of a session expire

functions/auth.php

@@ -16,6 +16,20 @@ function is_logged_in() {
     if ( session_is_registered('user_is_logged_in') ) {
         return;
     } else {
+        global $HTTP_POST_VARS, $PHP_SELF, $session_expired_post, 
+	       $session_expired_location;
+
+        /*  First we store some information in the new session to prevent
+         *  information-loss.
+         */
+	$session_expired_post = $HTTP_POST_VARS;
+        $session_expired_location = $PHP_SELF;
+        if (!session_is_registered('session_expired_post')) {    
+           session_register('session_expired_post');
+        }
+        if (!session_is_registered('session_expired_location')) {
+           session_register('session_expired_location');
+        }
         include_once( '../functions/display_messages.php' );
         logout_error( _("You must be logged in to access this page.") );
         exit;