Collection.php

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<?php
namespace Magento\Framework\Model\ResourceModel\Db\VersionControl;

abstract class Collection extends \Magento\Framework\Model\ResourceModel\Db\Collection\AbstractCollection
{
    protected $entitySnapshot;

    public function __construct(
        \Magento\Framework\Data\Collection\EntityFactoryInterface $entityFactory,
        \Psr\Log\LoggerInterface $logger,
        \Magento\Framework\Data\Collection\Db\FetchStrategyInterface $fetchStrategy,
        \Magento\Framework\Event\ManagerInterface $eventManager,
        Snapshot $entitySnapshot,
        \Magento\Framework\DB\Adapter\AdapterInterface $connection = null,
        \Magento\Framework\Model\ResourceModel\Db\AbstractDb $resource = null
    ) {
        $this->entitySnapshot = $entitySnapshot;
        parent::__construct(
            $entityFactory,
            $logger,
            $fetchStrategy,
            $eventManager,
            $connection,
            $resource
        );
    }

    public function fetchItem()
    {
        $item = parent::fetchItem();
        if ($item) {
            $this->entitySnapshot->registerSnapshot($item);
        }
        return $item;
    }

    protected function beforeAddLoadedItem(\Magento\Framework\DataObject $item)
    {
        $this->entitySnapshot->registerSnapshot($item);
        return $item;
    }
}