StateKey.php

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<?php
namespace Magento\CatalogSearch\Model\Layer\Search;

use Magento\Catalog\Model\Layer\StateKeyInterface;

class StateKey extends \Magento\Catalog\Model\Layer\Category\StateKey implements StateKeyInterface
{
    protected $queryFactory;

    public function __construct(
        \Magento\Store\Model\StoreManagerInterface $storeManager,
        \Magento\Customer\Model\Session $customerSession,
        \Magento\Search\Model\QueryFactory $queryFactory
    ) {
        $this->queryFactory = $queryFactory;
        parent::__construct($storeManager, $customerSession);
    }

    public function toString($category)
    {
        return 'Q_' . $this->queryFactory->get()->getId()
        . '_' . \Magento\Catalog\Model\Layer\Category\StateKey::toString($category);
    }
}