SalesQuoteSaveAfterObserver.php

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<?php
namespace Magento\Checkout\Observer;

use Magento\Framework\Event\ObserverInterface;

class SalesQuoteSaveAfterObserver implements ObserverInterface
{
    protected $checkoutSession;

    public function __construct(\Magento\Checkout\Model\Session $checkoutSession)
    {
        $this->checkoutSession = $checkoutSession;
    }

    public function execute(\Magento\Framework\Event\Observer $observer)
    {
        $quote = $observer->getEvent()->getQuote();
        /* @var $quote \Magento\Quote\Model\Quote */
        if ($quote->getIsCheckoutCart()) {
            $this->checkoutSession->getQuoteId($quote->getId());
        }
    }
}