Automatically check the “Save my name, email, and website in this browser for the next time I comment.” box in WordPress

Surprisingly WordPress always seems to leave the box unchecked when loading a page, so a user has to keep checking it each time they want to leave a comment to keep their name saved. With this simple JavaScript snippet the checkbox will be prefilled if a user has previously checked it and submitted a comment.

<?php
/**
 * Automatically tick the "Save my data in this browser" checkbox on comments if it was ticked before.
 */
add_action('wp_footer', function() {
    if(is_single() && comments_open()):
    ?>
        <script>
            if(document.cookie && document.cookie.includes('comment_author_')) {
                document.getElementById('wp-comment-cookies-consent').checked = true;
            }
        </script>
    <?php
    endif;
});