DefaultTemplate.php

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<?php
namespace Magento\Email\Controller\Adminhtml\Email\Template;

class DefaultTemplate extends \Magento\Email\Controller\Adminhtml\Email\Template
{
    private $emailConfig;

    private $serializer;

    public function __construct(
        \Magento\Backend\App\Action\Context $context,
        \Magento\Framework\Registry $coreRegistry,
        \Magento\Email\Model\Template\Config $emailConfig,
        \Magento\Framework\Serialize\Serializer\Json $serializer = null
    ) {
        $this->emailConfig = $emailConfig;
        $this->serializer = $serializer ?: \Magento\Framework\App\ObjectManager::getInstance()
            ->get(\Magento\Framework\Serialize\Serializer\Json::class);
        parent::__construct($context, $coreRegistry);
    }

    public function execute()
    {
        $this->_view->loadLayout();
        $template = $this->_initTemplate('id');
        $templateId = $this->getRequest()->getParam('code');
        try {
            $parts = $this->emailConfig->parseTemplateIdParts($templateId);
            $templateId = $parts['templateId'];
            $theme = $parts['theme'];

            if ($theme) {
                $template->setForcedTheme($templateId, $theme);
            }
            $template->setForcedArea($templateId);

            $template->loadDefault($templateId);
            $template->setData('orig_template_code', $templateId);
            $template->setData(
                'template_variables',
                $this->serializer->serialize($template->getVariablesOptionArray(true))
            );

            $templateBlock = $this->_view->getLayout()->createBlock(
                \Magento\Email\Block\Adminhtml\Template\Edit::class,
                'template_edit',
                [
                    'data' => [
                        'email_template' => $template
                    ]
                ]
            );
            $template->setData('orig_template_currently_used_for', $templateBlock->getCurrentlyUsedForPaths(false));

            $this->getResponse()->representJson(
                $this->serializer->serialize($template->getData())
            );
        } catch (\Exception $e) {
            $this->_objectManager->get(\Psr\Log\LoggerInterface::class)->critical($e);
        }
    }
}