Regression test for new order with variant overrides

The bug here occurs after adding customer details and clicking on the payments tab; the user is redirected to the customer details tab for no reason and gets stuck.

spec/features/admin/order_spec.rb

@@ -174,6 +174,63 @@ def new_order_with_distribution(distributor, order_cycle)
     expect(order.reload.line_items.first.quantity).to eq(1000)
   end
 
+  # Regression test for #7337
+  context "creating a new order with a variant override" do
+    let!(:override) { create(:variant_override, hub: distributor, variant: product.variants.first,
+                                                      count_on_hand: 100) }
+
+    before do
+      product.variants.first.update(on_demand: false, on_hand: 0)
+
+      login_as user
+      new_order_with_distribution(distributor, order_cycle)
+      expect(page).to have_content I18n.t('spree.add_product').upcase
+    end
+
+    it "creates order and shipment successfully and allows proceeding to payment" do
+      select2_select product.name, from: 'add_variant_id', search: true
+
+      within("table.stock-levels") do
+        expect(page).to have_selector("#stock_item_quantity")
+        fill_in "stock_item_quantity", with: 50
+        find("button.add_variant").click
+      end
+
+      expect(page).to_not have_selector("table.stock-levels")
+      expect(page).to have_selector("table.stock-contents")
+
+      within("tr.stock-item") do
+        expect(page).to have_text("50 x")
+      end
+
+      order = Spree::Order.last
+      expect(order.line_items.first.quantity).to eq(50)
+      expect(order.shipments.count).to eq(1)
+
+      click_button "Update And Recalculate Fees"
+      expect(page).to have_selector 'h1', text: "Customer Details"
+
+      fill_in "order_email", with: "[email protected]"
+      check "order_use_billing"
+      fill_in "order_bill_address_attributes_firstname", with: "xxx"
+      fill_in "order_bill_address_attributes_lastname", with: "xxx"
+      fill_in "order_bill_address_attributes_address1", with: "xxx"
+      fill_in "order_bill_address_attributes_city", with: "xxx"
+      fill_in "order_bill_address_attributes_zipcode", with: "xxx"
+      select "Australia", from: "order_bill_address_attributes_country_id"
+      select "Victoria", from: "order_bill_address_attributes_state_id"
+      fill_in "order_bill_address_attributes_phone", with: "xxx"
+
+      click_button "Update"
+
+      expect(page).to have_content "Customer Details updated"
+
+      click_link "Payments"
+
+      expect(page).to have_content "New Payment"
+    end
+  end
+
   scenario "can't change distributor or order cycle once order has been finalized" do
     login_as_admin_and_visit spree.edit_admin_order_path(order)