Edit.php

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

class Edit extends \Magento\Widget\Controller\Adminhtml\Widget\Instance
{
    public function execute()
    {
        $widgetInstance = $this->_initWidgetInstance();
        if (!$widgetInstance) {
            $this->_redirect('adminhtml/*/');
            return;
        }

        $this->_initAction();
        $this->_view->getPage()->getConfig()->getTitle()->prepend(
            $widgetInstance->getId() ? $widgetInstance->getTitle() : __('New Widget')
        );
        $this->_view->getPage()->getConfig()->getTitle()->prepend(__('Widgets'));
        $this->_view->renderLayout();
    }
}