Edit.php

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<?php
namespace Magento\Theme\Controller\Adminhtml\Design\Config;

use Magento\Backend\App\Action;
use Magento\Backend\App\Action\Context;
use Magento\Backend\Model\View\Result\Page as ResultPage;
use Magento\Framework\App\Config\ScopeConfigInterface;
use Magento\Framework\App\ScopeValidatorInterface as ScopeValidator;
use Magento\Framework\Controller\Result\Redirect as ResultRedirect;
use Magento\Framework\View\Result\PageFactory as ResultPageFactory;
use Magento\Framework\App\ScopeResolverPool;

class Edit extends Action
{
    protected $resultPageFactory;

    protected $scopeValidator;

    protected $scopeResolverPool;

    public function __construct(
        Context $context,
        ResultPageFactory $resultPageFactory,
        ScopeValidator $scopeValidator,
        ScopeResolverPool $scopeResolverPool
    ) {
        $this->resultPageFactory = $resultPageFactory;
        $this->scopeValidator = $scopeValidator;
        $this->scopeResolverPool = $scopeResolverPool;
        parent::__construct($context);
    }

    public function execute()
    {
        $scope = $this->getRequest()->getParam('scope');
        $scopeId = $this->getRequest()->getParam('scope_id');

        if (!$this->scopeValidator->isValidScope($scope, $scopeId)) {
            $resultRedirect = $this->resultRedirectFactory->create();
            $resultRedirect->setPath('theme/design_config/');
            return $resultRedirect;
        }

        $resultPage = $this->resultPageFactory->create();
        $resultPage->setActiveMenu('Magento_Theme::design_config');
        $resultPage->getConfig()->getTitle()->prepend(__('%1', $this->getScopeTitle()));
        return $resultPage;
    }

    protected function getScopeTitle()
    {
        $scope = $this->getRequest()->getParam('scope');
        $scopeId = $this->getRequest()->getParam('scope_id');

        if ($scope != ScopeConfigInterface::SCOPE_TYPE_DEFAULT) {
            $scopeResolver = $this->scopeResolverPool->get($scope);
            $scopeObject = $scopeResolver->getScope($scopeId);
            return __('%1', $scopeObject->getName());
        }

        return __('Global');
    }

    protected function _isAllowed()
    {
        return $this->_authorization->isAllowed('Magento_Config::config_design');
    }
}