#20918: Enabled 'Shopping Cart' tab for customer edit interface in admin.

Author: p-bystritsky

app/code/Magento/Customer/Model/CustomerIdProvider.php

@@ -0,0 +1,40 @@
+<?php
+/**
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+declare(strict_types=1);
+
+namespace Magento\Customer\Model;
+
+use Magento\Framework\App\RequestInterface;
+
+/**
+ * Provides customer id from request.
+ */
+class CustomerIdProvider
+{
+    /**
+     * @var RequestInterface
+     */
+    private $request;
+
+    /**
+     * @param RequestInterface $request
+     */
+    public function __construct(
+        RequestInterface $request
+    ) {
+        $this->request = $request;
+    }
+
+    /**
+     * Get customer id from request.
+     *
+     * @return int
+     */
+    public function getCustomerId(): int
+    {
+        return (int)$this->request->getParam('id');
+    }
+}

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

@@ -6,7 +6,7 @@
 namespace Magento\Sales\Block\Adminhtml;
 
 use Magento\Backend\Block\Template\Context;
-use Magento\Customer\Controller\RegistryConstants;
+use Magento\Customer\Model\CustomerIdProvider;
 use Magento\Framework\Registry;
 use Magento\Ui\Component\Layout\Tabs\TabWrapper;
 
@@ -18,36 +18,32 @@
 class ShoppingCartsTab extends TabWrapper
 {
     /**
-     * Core registry
-     *
-     * @var Registry
+     * @var bool
      */
-    private $coreRegistry;
+    protected $isAjaxLoaded = true;
 
     /**
-     * @var bool
+     * @var CustomerIdProvider
      */
-    protected $isAjaxLoaded = true;
+    private $customerIdProvider;
 
     /**
-     * Constructor
-     *
      * @param Context $context
-     * @param Registry $registry
+     * @param CustomerIdProvider $customerIdProvider
      * @param array $data
      */
-    public function __construct(Context $context, Registry $registry, array $data = [])
+    public function __construct(Context $context, CustomerIdProvider $customerIdProvider, array $data = [])
     {
-        $this->coreRegistry = $registry;
         parent::__construct($context, $data);
+        $this->customerIdProvider = $customerIdProvider;
     }
 
     /**
      * @inheritdoc
      */
     public function canShowTab()
     {
-        return $this->coreRegistry->registry(RegistryConstants::CURRENT_CUSTOMER_ID);
+        return $this->customerIdProvider->getCustomerId();
     }
 
     /**