Checkout Controller Cart > Backward compatible

Author: rafaelstz

app/code/Magento/Checkout/Controller/Cart.php

@@ -7,7 +7,6 @@
 
 use Magento\Catalog\Controller\Product\View\ViewInterface;
 use Magento\Checkout\Model\Cart as CustomerCart;
-use Magento\Framework\Escaper;
 
 /**
  * Shopping cart controller
@@ -43,14 +42,15 @@ abstract class Cart extends \Magento\Framework\App\Action\Action implements View
     * @var \Magento\Framework\Escaper
     */
     protected $escaper;
-    
+
     /**
      * @param \Magento\Framework\App\Action\Context $context
      * @param \Magento\Framework\App\Config\ScopeConfigInterface $scopeConfig
      * @param \Magento\Checkout\Model\Session $checkoutSession
      * @param \Magento\Store\Model\StoreManagerInterface $storeManager
      * @param \Magento\Framework\Data\Form\FormKey\Validator $formKeyValidator
      * @param CustomerCart $cart
+     * @param \Magento\Framework\Escaper $escaper
      * @codeCoverageIgnore
      */
     public function __construct(
@@ -60,14 +60,14 @@ public function __construct(
         \Magento\Store\Model\StoreManagerInterface $storeManager,
         \Magento\Framework\Data\Form\FormKey\Validator $formKeyValidator,
         CustomerCart $cart,
-        Escaper $escaper
+        \Magento\Framework\Escaper $escaper = null
     ) {
         $this->_formKeyValidator = $formKeyValidator;
         $this->_scopeConfig = $scopeConfig;
         $this->_checkoutSession = $checkoutSession;
         $this->_storeManager = $storeManager;
         $this->cart = $cart;        
-        $this->escaper = $escaper;
+        $this->escaper = $escaper ?: \Magento\Framework\App\ObjectManager::getInstance()->get(\Magento\Framework\Escaper::class);
         parent::__construct($context);
     }