Ticket #41194: 41194.1.patch

src/wp-includes/functions.php

@@ -5455 +5455 @@
  * This prevents reusing the same tab for a preview when the user has navigated away.
  *
  * @since 4.3.0
+ *
+ * @global $post
  */
 function wp_post_preview_js() {
         global $post;