CartUpdateBefore.php

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<?php
namespace Magento\Wishlist\Observer;

use Magento\Framework\Event\Observer;
use Magento\Framework\Event\ObserverInterface;
use Magento\Wishlist\Helper\Data;
use Magento\Wishlist\Model\Wishlist;
use Magento\Wishlist\Model\WishlistFactory;

class CartUpdateBefore implements ObserverInterface
{
    protected $wishlistData;

    protected $wishlistFactory;

    public function __construct(
        Data $wishlistData,
        WishlistFactory $wishlistFactory
    ) {
        $this->wishlistData = $wishlistData;
        $this->wishlistFactory = $wishlistFactory;
    }

    protected function getWishlist($customerId)
    {
        if (!$customerId) {
            return false;
        }
        return $this->wishlistFactory->create()->loadByCustomerId($customerId, true);
    }

    public function execute(Observer $observer)
    {
        $cart = $observer->getEvent()->getCart();
        $data = $observer->getEvent()->getInfo()->toArray();
        $productIds = [];

        $wishlist = $this->getWishlist($cart->getQuote()->getCustomerId());
        if (!$wishlist) {
            return $this;
        }

        foreach ($data as $itemId => $itemInfo) {
            if (!empty($itemInfo['wishlist']) && ($item = $cart->getQuote()->getItemById($itemId))) {
                $productId = $item->getProductId();
                $buyRequest = $item->getBuyRequest();

                if (array_key_exists('qty', $itemInfo) && is_numeric($itemInfo['qty'])) {
                    $buyRequest->setQty($itemInfo['qty']);
                }
                $wishlist->addNewItem($productId, $buyRequest);

                $productIds[] = $productId;
                $cart->getQuote()->removeItem($itemId);
            }
        }

        if (count($productIds)) {
            $wishlist->save();
            $this->wishlistData->calculate();
        }
        return $this;
    }
}