isOrderStateMail example

'data' => [],
        ];

        foreach ($mails as $mail) {
            $node = [
                'leaf' => true,
                'name' => $mail->getName(),
                'id' => $mail->getId(),
                'iconCls' => 'sprite-mail',
            ];

            if ($mail->isOrderStateMail()) {
                $orderStatus = $mail->getStatus();
                if ($orderStatus !== null) {
                    $node['name'] = $this->get('snippets')
                        ->getNamespace('backend/static/order_status')
                        ->get($orderStatus->getName());
                }
                $orderNodes['data'][] = $node;
            } elseif ($mail->isPaymentStateMail()) {
                $paymentStatus = $mail->getStatus();
                if ($paymentStatus !== null) {
                    $node['name'] = $this->get('snippets')