ProductLinks.php

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<?php
namespace Magento\CatalogInventory\Model\Plugin;

use Magento\Catalog\Model\Product\Link;
use Magento\Catalog\Model\ResourceModel\Product\Link\Product\Collection;
use Magento\CatalogInventory\Helper\Stock;
use Magento\CatalogInventory\Model\Configuration;

class ProductLinks
{
    private $configuration;

    private $stockHelper;

    public function __construct(Configuration $configuration, Stock $stockHelper)
    {
        $this->configuration = $configuration;
        $this->stockHelper = $stockHelper;
    }

    public function afterGetProductCollection(Link $subject, Collection $collection)
    {
        if ($this->configuration->isShowOutOfStock() != 1) {
            $this->stockHelper->addInStockFilterToCollection($collection);
        }
        return $collection;
    }
}