Ticket #21899: 21899.2.diff

src/wp-includes/post-template.php

@@ -450 +450 @@
                         $classes[] = 'format-standard';
         }
 
+        // Post is protected
+        if ( ! empty( $post->post_password ) ) {
+                $classes[] = 'visibility-protected';
+        }
+
+        if ( 'private' === $post->post_status ) {
+                $classes[] = 'visibility-private';
+        }
+
+        if ( 'public' === $post->post_status ) {
+                $classes[] = 'visibility-public';
+        }
+
         // Post requires password
         if ( post_password_required( $post->ID ) ) {
                 $classes[] = 'post-password-required';