WordPress Editor problem in 4.9 – Update

After updating the WP to v 4.9, I’m unable to edit the theme from the Appearance -> Editor page. Solution: Don’t downgrade the WP just need to replace 2 files with 4.8.3 wp files as in the path wp-admin/theme-editor.php wp-admin/includes/file.php With the same named files from build 4.8.3 Now you can edit the files