CartTab.php

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<?php
namespace Magento\Checkout\Block\Adminhtml;

use Magento\Customer\Controller\RegistryConstants;
use Magento\Framework\Registry;
use Magento\Framework\View\Element\Context;
use Magento\Ui\Component\Layout\Tabs\TabWrapper;

class CartTab extends TabWrapper
{
    protected $coreRegistry = null;

    protected $isAjaxLoaded = true;

    public function __construct(Context $context, Registry $registry, array $data = [])
    {
        $this->coreRegistry = $registry;
        parent::__construct($context, $data);
    }

    public function canShowTab()
    {
        return $this->coreRegistry->registry(RegistryConstants::CURRENT_CUSTOMER_ID);
    }

    public function getTabLabel()
    {
        return __('Shopping Cart');
    }

    public function getTabUrl()
    {
        return $this->getUrl('customer/*/carts', ['_current' => true]);
    }
}