Ticket #21899: 21899.3.diff

src/wp-includes/post-template.php

@@ -450 +450 @@
                         $classes[] = 'format-standard';
         }
 
-        // Post requires password
-        if ( post_password_required( $post->ID ) ) {
+        $post_password_required = post_password_required( $post->ID );
+
+        // Post requires password.
+        if ( $post_password_required ) {
                 $classes[] = 'post-password-required';
-        // Post thumbnails
-        } elseif ( ! is_attachment( $post ) && current_theme_supports( 'post-thumbnails' ) && has_post_thumbnail( $post->ID ) ) {
+        } elseif ( ! empty( $post->post_password ) ) {
+                $classes[] = 'post-password-protected';
+        }
+
+        // Post thumbnails.
+        if ( current_theme_supports( 'post-thumbnails' ) && has_post_thumbnail( $post->ID ) && ! is_attachment( $post ) && ! $post_password_required ) {
                 $classes[] = 'has-post-thumbnail';
         }