Provide notification of duplication in gravity forms.

duped_notification.php

//Show Notification of Duped
add_action("gform_editor_js", 'notify_of_dupe');
function notify_of_dupe(){
    if($_GET['duped'] === 'true'): ?>

    <script>

        (function($){
            var notification = '<div style="border-left-color:#46b450" class="updated_base gform_editor_status" id="after_update_dialog">' +
                '<strong>Form duplicated successfully.</strong>' +
                '</div>';
            $("#gf_form_toolbar").after(notification);

        })(jQuery);


    </script>

    <?php endif;
}