Created separate block class inheriting TabWrapper and removed public methods from API block class

Author: rav-redchamps

app/code/Magento/Customer/Block/Adminhtml/Edit/Tab/Carts.php

@@ -97,59 +97,4 @@ protected function _getCustomer()
         );
         return $customerDataObject;
     }
-
-    /**
-     * @return bool
-     */
-    public function canShowTab()
-    {
-        if ($this->_getCustomer()->getId()) {
-            return true;
-        }
-        return false;
-    }
-
-    /**
-     * @return \Magento\Framework\Phrase
-     */
-    public function getTabLabel()
-    {
-        return __('Shopping cart');
-    }
-
-    /**
-     * @return \Magento\Framework\Phrase
-     */
-    public function getTabTitle()
-    {
-        return __('Shopping cart');
-    }
-
-    /**
-     * Return URL link to Tab content, used with isAjaxLoaded to true
-     *
-     * @return string
-     */
-    public function getTabUrl()
-    {
-        return $this->getUrl('customer/*/cart', ['_current' => true]);
-    }
-
-    /**
-     * Tab should be loaded trough Ajax call
-     *
-     * @return bool
-     */
-    public function isAjaxLoaded()
-    {
-        return true;
-    }
-
-    /**
-     * @return bool
-     */
-    public function canDisplayContainer()
-    {
-        return true;
-    }
 }

app/code/Magento/Sales/Block/Adminhtml/ShoppingCartsTab.php

@@ -0,0 +1,74 @@
+<?php
+/**
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+namespace Magento\Sales\Block\Adminhtml;
+
+use Magento\Backend\Block\Template\Context;
+use Magento\Customer\Controller\RegistryConstants;
+use Magento\Framework\Registry;
+use Magento\Ui\Component\Layout\Tabs\TabWrapper;
+
+/**
+ * Class ShoppingCarts
+ *
+ * @package Magento\Sales\Block\Adminhtml
+ */
+class ShoppingCartsTab extends TabWrapper
+{
+    /**
+     * Core registry
+     *
+     * @var Registry
+     */
+    protected $coreRegistry = null;
+
+    /**
+     * @var bool
+     */
+    protected $isAjaxLoaded = true;
+
+    /**
+     * Constructor
+     *
+     * @param Context $context
+     * @param Registry $registry
+     * @param array $data
+     */
+    public function __construct(Context $context, Registry $registry, array $data = [])
+    {
+        $this->coreRegistry = $registry;
+        parent::__construct($context, $data);
+    }
+
+    /**
+     * @inheritdoc
+     */
+    public function canShowTab()
+    {
+        return $this->coreRegistry->registry(RegistryConstants::CURRENT_CUSTOMER_ID);
+    }
+
+    /**
+     * Return Tab label
+     *
+     * @codeCoverageIgnore
+     *
+     * @return \Magento\Framework\Phrase
+     */
+    public function getTabLabel()
+    {
+        return __('Shopping cart');
+    }
+
+    /**
+     * Return URL link to Tab content
+     *
+     * @return string
+     */
+    public function getTabUrl()
+    {
+        return $this->getUrl('customer/*/cart', ['_current' => true]);
+    }
+}

app/code/Magento/Sales/view/base/ui_component/customer_form.xml

@@ -6,10 +6,10 @@
  */
 -->
 <form xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:module:Magento_Ui:etc/ui_configuration.xsd">
-    <htmlContent name="cart_content">
-        <block class="Magento\Customer\Block\Adminhtml\Edit\Tab\Carts" name="cart"/>
-    </htmlContent>
     <htmlContent name="orders_content">
         <block acl="Magento_Sales::actions_view" class="Magento\Sales\Block\Adminhtml\CustomerOrdersTab" name="orders" />
     </htmlContent>
+    <htmlContent name="cart_content">
+        <block class="Magento\Sales\Block\Adminhtml\ShoppingCartsTab" name="cart"/>
+    </htmlContent>
 </form>