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

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