Temporary fix for Gravity Forms merge tags on form notification edit screens

gravityforms.php

<?php
/**
 * Temporary fix for Gravity Forms merge tags on form notification edit screens
 *
 * @see https://github.com/roots/acorn/issues/198
 */
add_action('admin_footer', function (): void {
    // Only on GF admin pages
    if (!class_exists('GFForms') || !isset($_GET['page']) || 'gf_edit_forms' !== $_GET['page']) {
        return;
    }
    ?>
    <script>
        const gfFixEl = document.querySelector('select[name="_gform_setting_event"]');
        if (gfFixEl) {
            gfFixEl.setAttribute('id', 'event');
            console.log('Gravity Forms merge tags fix applied via `mu-plugins/gravity-forms.php`')
        }
    </script>
    <?php
}, 100);