title: navigationBarTitle works on iOS not MacOS apps
body: <p>the following code compiles and runs just fine on iOS and Catalyst.  But when I run it in a macOS app it get an error.  Is this a known bug or am I doing something wrong.  macOS Catalina version 10.15.3, Xcode version 11.3.1.</p>
  
  <pre><code>import SwiftUI
  
  struct ContentView: View {
      var body: some View {
  
          NavigationView {
              List {
                  Text("Item #1")
                  Text("Item #2")
              }
              .navigationBarTitle("Title", displayMode: .inline)
              .navigationBarItems(leading: Text("Add"))
          }
      }
  }
  
  struct ContentView_Previews: PreviewProvider {
      static var previews: some View {
          ContentView()
      }
  }
  </code></pre>
  
  <p>here is the error that I get,</p>
  
  <p><code>Value of type 'List&lt;Never, TupleView&lt;(Text, Text)&gt;&gt;' has no member 'navigationBarTitle'</code></p>