Ticket #21899: Refreshed_patch_from_21899.patch

wp-includes/post-template.php

@@ -427 +427 @@
                         $classes[] = 'format-standard';
         }
 
+        // Post is protected
+        if ( !empty($post->post_password) )
+                $classes[] = 'protected';
+
         // Post requires password
         if ( post_password_required( $post->ID ) ) {
                 $classes[] = 'post-password-required';