AvailabilityFlag.php

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<?php
namespace Magento\Catalog\Model\Layer\Category;

use Magento\Catalog\Model\Layer\AvailabilityFlagInterface;

class AvailabilityFlag implements AvailabilityFlagInterface
{
    public function isEnabled($layer, array $filters = [])
    {
        return $this->canShowOptions($filters) || count($layer->getState()->getFilters());
    }

    protected function canShowOptions($filters)
    {
        foreach ($filters as $filter) {
            if ($filter->getItemsCount()) {
                return true;
            }
        }

        return false;
    }
}