MAGETWO-66666: Adding a product to cart from category page with an expired session does not allow product to be added

- Add reload and error message

Author: stkorf

app/code/Magento/Catalog/view/frontend/web/js/catalog-add-to-cart.js

@@ -159,6 +159,13 @@ define([
                             .html(res.product.statusText);
                     }
                     self.enableAddToCartButton(form);
+                },
+
+                /** @inheritdoc */
+                complete: function (res) {
+                    if (res.state() == 'rejected') {
+                        location.reload();
+                    }
                 }
             });
         },

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

@@ -80,6 +80,9 @@ protected function _initProduct()
     public function execute()
     {
         if (!$this->_formKeyValidator->validate($this->getRequest())) {
+            $this->messageManager->addErrorMessage(
+                __('Your session has expired')
+            );
             return $this->resultRedirectFactory->create()->setPath('*/*/');
         }