ENGCOM-3219: #17744 Adding logic to get default billing address used on Cart and Checkout #18095

Author: Stanislav Idolov

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

@@ -218,16 +218,31 @@ define([
          * Apply resolved billing address to quote
          */
         applyBillingAddress: function () {
-            var shippingAddress;
+            var shippingAddress,
+                isBillingAddressInitialized;
 
             if (quote.billingAddress()) {
                 selectBillingAddress(quote.billingAddress());
 
                 return;
             }
+
+            if (quote.isVirtual()) {
+                isBillingAddressInitialized = addressList.some(function (addrs) {
+                    if (addrs.isDefaultBilling()) {
+                        selectBillingAddress(addrs);
+
+                        return true;
+                    }
+
+                    return false;
+                });
+            }
+
             shippingAddress = quote.shippingAddress();
 
-            if (shippingAddress &&
+            if (!isBillingAddressInitialized &&
+                shippingAddress &&
                 shippingAddress.canUseForBilling() &&
                 (shippingAddress.isDefaultShipping() || !quote.isVirtual())
             ) {

dev/tests/js/jasmine/tests/app/code/Magento/Braintree/frontend/js/view/payment/method-renderer/cc-form.test.js

@@ -19,7 +19,12 @@ define([
                     billingAddress: ko.observable(),
                     shippingAddress: ko.observable(),
                     paymentMethod: ko.observable(),
-                    totals: ko.observable({})
+                    totals: ko.observable({}),
+
+                    /** Stub */
+                    isVirtual: function () {
+                        return false;
+                    }
                 },
                 'Magento_Braintree/js/view/payment/validator-handler': jasmine.createSpyObj(
                     'validator-handler',

dev/tests/js/jasmine/tests/app/code/Magento/Braintree/frontend/js/view/payment/method-renderer/paypal.test.js

@@ -24,7 +24,12 @@ define([
                     paymentMethod: ko.observable(),
                     totals: ko.observable({
                         'base_grand_total': 0
-                    })
+                    }),
+
+                    /** Stub */
+                    isVirtual: function () {
+                        return false;
+                    }
                 },
                 'Magento_Braintree/js/view/payment/adapter': {
                     config: {},

dev/tests/js/jasmine/tests/app/code/Magento/Paypal/frontend/js/view/payment/method-renderer/paypal-express-abstract.test.js

@@ -28,8 +28,12 @@ define([
                     billingAddress: ko.observable(),
                     shippingAddress: ko.observable(),
                     paymentMethod: ko.observable(),
-                    totals: ko.observable({})
+                    totals: ko.observable({}),
 
+                    /** Stub */
+                    isVirtual: function () {
+                        return false;
+                    }
                 },
                 'Magento_Checkout/js/action/set-payment-information': setPaymentMock,
                 'Magento_Checkout/js/model/payment/additional-validators': {