State.php

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<?php
namespace Magento\LayeredNavigation\Block\Navigation;

use Magento\Framework\View\Element\Template;

class State extends \Magento\Framework\View\Element\Template
{
    protected $_template = 'Magento_LayeredNavigation::layer/state.phtml';

    protected $_catalogLayer;

    public function __construct(
        \Magento\Framework\View\Element\Template\Context $context,
        \Magento\Catalog\Model\Layer\Resolver $layerResolver,
        array $data = []
    ) {
        $this->_catalogLayer = $layerResolver->get();
        parent::__construct($context, $data);
    }

    public function getActiveFilters()
    {
        $filters = $this->getLayer()->getState()->getFilters();
        if (!is_array($filters)) {
            $filters = [];
        }
        return $filters;
    }

    public function getClearUrl()
    {
        $filterState = [];
        foreach ($this->getActiveFilters() as $item) {
            $filterState[$item->getFilter()->getRequestVar()] = $item->getFilter()->getCleanValue();
        }
        $params['_current'] = true;
        $params['_use_rewrite'] = true;
        $params['_query'] = $filterState;
        $params['_escape'] = true;
        return $this->_urlBuilder->getUrl('*/*/*', $params);
    }

    public function getLayer()
    {
        if (!$this->hasData('layer')) {
            $this->setLayer($this->_catalogLayer);
        }
        return $this->_getData('layer');
    }
}