CatalogProductSaveAfterObserver.php

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<?php
namespace Magento\Sales\Observer\Backend;

use Magento\Framework\Event\ObserverInterface;

class CatalogProductSaveAfterObserver implements ObserverInterface
{
    protected $_quote;

    public function __construct(\Magento\Quote\Model\ResourceModel\Quote $quote)
    {
        $this->_quote = $quote;
    }

    protected function _recollectQuotes($productId, $status)
    {
        if ($status != \Magento\Catalog\Model\Product\Attribute\Source\Status::STATUS_ENABLED) {
            $this->_quote->markQuotesRecollect($productId);
        }
    }

    public function execute(\Magento\Framework\Event\Observer $observer)
    {
        $product = $observer->getEvent()->getProduct();
        $this->_recollectQuotes($product->getId(), $product->getStatus());
    }
}