SalesEventOrderToQuoteObserver.php

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<?php
namespace Magento\GiftMessage\Observer;

use Magento\Framework\Event\ObserverInterface;

class SalesEventOrderToQuoteObserver implements ObserverInterface
{
    protected $_giftMessageMessage = null;

    protected $_messageFactory;

    public function __construct(
        \Magento\GiftMessage\Model\MessageFactory $messageFactory,
        \Magento\GiftMessage\Helper\Message $giftMessageMessage
    ) {
        $this->_messageFactory = $messageFactory;
        $this->_giftMessageMessage = $giftMessageMessage;
    }

    public function execute(\Magento\Framework\Event\Observer $observer)
    {
        $order = $observer->getEvent()->getOrder();
        // Do not import giftmessage data if order is reordered
        if ($order->getReordered()) {
            return $this;
        }

        if (!$this->_giftMessageMessage->isMessagesAllowed('order', $order, $order->getStore())) {
            return $this;
        }
        $giftMessageId = $order->getGiftMessageId();
        if ($giftMessageId) {
            $giftMessage = $this->_messageFactory->create()->load($giftMessageId)->setId(null)->save();
            $observer->getEvent()->getQuote()->setGiftMessageId($giftMessage->getId());
        }

        return $this;
    }
}