Index.php

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<?php
namespace Magento\Widget\Controller\Adminhtml\Widget;

use Magento\Framework\App\Action\HttpPostActionInterface as HttpPostActionInterface;

class Index extends \Magento\Backend\App\Action implements HttpPostActionInterface
{
    const ADMIN_RESOURCE = 'Magento_Widget::widget_instance';

    protected $_coreRegistry;

    protected $_widgetConfig;

    public function __construct(
        \Magento\Backend\App\Action\Context $context,
        \Magento\Widget\Model\Widget\Config $widgetConfig,
        \Magento\Framework\Registry $coreRegistry
    ) {
        $this->_widgetConfig = $widgetConfig;
        $this->_coreRegistry = $coreRegistry;
        parent::__construct($context);
    }

    public function execute()
    {
        // save extra params for widgets insertion form
        $skipped = $this->getRequest()->getParam('skip_widgets');
        $skipped = $this->_widgetConfig->decodeWidgetsFromQuery($skipped);

        $this->_coreRegistry->register('skip_widgets', $skipped);

        $this->_view->loadLayout('empty')->renderLayout();
    }
}