Supply/fill Country field on the Welcome Back pages. We need this because the Welcome Back page does not cache Country (known issue).

welcome_back_country_fill.html

<?
    // SalsaScript to check if the supporter is logged in.  If so,
    // it deposits the script that populates/appends the Country field.
    (function() {
        var country = null;
        if (Supporter == null) { return; }
        country = Supporter.get("Country");
        country = (country == null) ? "US" : country;
?>
    <!-- BEGIN Supply/fill country field on Welcome Back pages. -->
    <script type="text/javascript">
        (function (country) {
            document.addEventListener("DOMContentLoaded", () => {
                var f = document.querySelector('form[name="subform"]');
                if (f == null) { return; }
                var e = document.querySelector('*[name="Country"]');
                if (e != null) {
                    e.value = country;
                } else {
                    e = document.createElement("input");
                    e.type = "hidden";
                    e.name = "Country";
                    e.value = country;
                    f.appendChild(e);
                }
            });
        })("<?= country ?>");
    </script>
    <!-- END   Supply/fill country field on Welcome Back pages. -->
<?
    })();
?>