SalesEventOrderItemToQuoteItemObserver.php

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<?php
namespace Magento\GiftMessage\Observer;

use Magento\Framework\Event\ObserverInterface;

class SalesEventOrderItemToQuoteItemObserver 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)
    {
        $orderItem = $observer->getEvent()->getOrderItem();
        // Do not import giftmessage data if order is reordered
        $order = $orderItem->getOrder();
        if ($order && $order->getReordered()) {
            return $this;
        }

        $isAvailable = $this->_giftMessageMessage->isMessagesAllowed(
            'order_item',
            $orderItem,
            $orderItem->getStoreId()
        );
        if (!$isAvailable) {
            return $this;
        }

        $quoteItem = $observer->getEvent()->getQuoteItem();
        if ($giftMessageId = $orderItem->getGiftMessageId()) {
            $giftMessage = $this->_messageFactory->create()->load($giftMessageId)->setId(null)->save();
            $quoteItem->setGiftMessageId($giftMessage->getId());
        }

        return $this;
    }
}