MAGETWO-96850: [2.3.x] One page Checkout resets Customer data if Product Qty was changed

- Changed the logic of getting checkout data

Author: vital-pantsialeyeu

app/code/Magento/Checkout/view/frontend/web/js/checkout-data.js

@@ -10,7 +10,8 @@
  */
 define([
     'jquery',
-    'Magento_Customer/js/customer-data'
+    'Magento_Customer/js/customer-data',
+    'jquery/jquery-storageapi'
 ], function ($, storage) {
     'use strict';
 
@@ -30,20 +31,27 @@ define([
             var data = storage.get(cacheKey)();
 
             if ($.isEmptyObject(data)) {
-                data = {
-                    'selectedShippingAddress': null, //Selected shipping address pulled from persistence storage
-                    'shippingAddressFromData': null, //Shipping address pulled from persistence storage
-                    'newCustomerShippingAddress': null, //Shipping address pulled from persistence storage for customer
-                    'selectedShippingRate': null, //Shipping rate pulled from persistence storage
-                    'selectedPaymentMethod': null, //Payment method pulled from persistence storage
-                    'selectedBillingAddress': null, //Selected billing address pulled from persistence storage
-                    'billingAddressFromData': null, //Billing address pulled from persistence storage
-                    'newCustomerBillingAddress': null //Billing address pulled from persistence storage for new customer
-                };
-                saveData(data);
+                data = $.initNamespaceStorage('mage-cache-storage').localStorage.get(cacheKey);
+                if ($.isEmptyObject(data)) {
+                    data = initData();
+                    saveData(data);
+                }
             }
 
             return data;
+        },
+
+        initData = function () {
+            return {
+                'selectedShippingAddress': null, //Selected shipping address pulled from persistence storage
+                'shippingAddressFromData': null, //Shipping address pulled from persistence storage
+                'newCustomerShippingAddress': null, //Shipping address pulled from persistence storage for customer
+                'selectedShippingRate': null, //Shipping rate pulled from persistence storage
+                'selectedPaymentMethod': null, //Payment method pulled from persistence storage
+                'selectedBillingAddress': null, //Selected billing address pulled from persistence storage
+                'billingAddressFromData': null, //Billing address pulled from persistence storage
+                'newCustomerBillingAddress': null //Billing address pulled from persistence storage for new customer
+            }
         };
 
     return {