Is applied rule for cart page

Apply discount rules specifically on the cart page.

if (!function_exists('advanced_woo_discount_rules_is_rule_applied')) {
    function advanced_woo_discount_rules_is_rule_applied($rule_id)
    {
        if (class_exists('Wdr\App\Controllers\DiscountCalculator')) {
            $applied_rules = \Wdr\App\Controllers\DiscountCalculator::$applied_rules;
            return isset($applied_rules[$rule_id]);
        }
        return  false;
    }
}

Example
// advanced_woo_discount_rules_is_rule_applied(8);