MC-36884: Incorrect default country displayed on shipping page when store view is changed in cart

Author: nikita-shcherbatykh

app/code/Magento/Checkout/view/frontend/web/js/view/cart/shipping-estimation.js

@@ -78,9 +78,13 @@ define(
                     }
 
                     if (!quote.isVirtual()) {
-                        checkoutProvider.on('shippingAddress', function (shippingAddressData) {
-                            checkoutData.setShippingAddressFromData(shippingAddressData);
-                        });
+                            checkoutProvider.on('shippingAddress', function (shippingAddressData) {
+                                if (quote.shippingAddress().countryId !== shippingAddressData.country_id ||
+                                    (shippingAddressData.postcode || shippingAddressData.region_id)
+                                ) {
+                                    checkoutData.setShippingAddressFromData(shippingAddressData);
+                                }
+                            });
                     } else {
                         checkoutProvider.on('shippingAddress', function (shippingAddressData) {
                             checkoutData.setBillingAddressFromData(shippingAddressData);