diff -r 48c4eec2b7e6 -r 8c2e4d02f4ef wp/wp-includes/wp-diff.php
--- a/wp/wp-includes/wp-diff.php	Fri Sep 05 18:40:08 2025 +0200
+++ b/wp/wp-includes/wp-diff.php	Fri Sep 05 18:52:52 2025 +0200
@@ -8,6 +8,11 @@
  * @subpackage Diff
  */
 
+// Don't load directly.
+if ( ! defined( 'ABSPATH' ) ) {
+	die( '-1' );
+}
+
 if ( ! class_exists( 'Text_Diff', false ) ) {
 	/** Text_Diff class */
 	require ABSPATH . WPINC . '/Text/Diff.php';
@@ -15,6 +20,8 @@
 	require ABSPATH . WPINC . '/Text/Diff/Renderer.php';
 	/** Text_Diff_Renderer_inline class */
 	require ABSPATH . WPINC . '/Text/Diff/Renderer/inline.php';
+	/** Text_Exception class */
+	require ABSPATH . WPINC . '/Text/Exception.php';
 }
 
 require ABSPATH . WPINC . '/class-wp-text-diff-renderer-table.php';