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

@@ -24,6 +24,22 @@ define([
             storage.set(cacheKey, data);
         },
 
+        /**
+         * @return {*}
+         */
+        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 {*}
          */
@@ -32,26 +48,14 @@ define([
 
             if ($.isEmptyObject(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 {