Index.php

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

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

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

    public function execute()
    {
        $storeId = (int)$this->getRequest()->getParam('store');

        try {
            $this->_objectManager->get(\Magento\Cms\Helper\Wysiwyg\Images::class)->getCurrentPath();
        } catch (\Exception $e) {
            $this->messageManager->addErrorMessage($e->getMessage());
        }
        $this->_initAction();
        $resultLayout = $this->resultLayoutFactory->create();
        $resultLayout->addHandle('overlay_popup');
        $block = $resultLayout->getLayout()->getBlock('wysiwyg_images.js');
        if ($block) {
            $block->setStoreId($storeId);
        }
        return $resultLayout;
    }
}