Contents.php

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<?php
namespace Magento\Cms\Controller\Adminhtml\Wysiwyg\Images;

class Contents extends \Magento\Cms\Controller\Adminhtml\Wysiwyg\Images
{
    protected $resultLayoutFactory;

    protected $resultJsonFactory;

    public function __construct(
        \Magento\Backend\App\Action\Context $context,
        \Magento\Framework\Registry $coreRegistry,
        \Magento\Framework\View\Result\LayoutFactory $resultLayoutFactory,
        \Magento\Framework\Controller\Result\JsonFactory $resultJsonFactory
    ) {
        $this->resultLayoutFactory = $resultLayoutFactory;
        $this->resultJsonFactory = $resultJsonFactory;
        parent::__construct($context, $coreRegistry);
    }

    protected function _saveSessionCurrentPath()
    {
        $this->getStorage()->getSession()->setCurrentPath(
            $this->_objectManager->get(\Magento\Cms\Helper\Wysiwyg\Images::class)->getCurrentPath()
        );
        return $this;
    }

    public function execute()
    {
        try {
            $this->_initAction()->_saveSessionCurrentPath();
            $resultLayout = $this->resultLayoutFactory->create();
            return $resultLayout;
        } catch (\Exception $e) {
            $result = ['error' => true, 'message' => $e->getMessage()];
            $resultJson = $this->resultJsonFactory->create();
            $resultJson->setData($result);
            return $resultJson;
        }
    }
}