title: SwiftUI artefact after detail with list is presented
body: <p>With the simple navigation-link structure below, I get a strange artefact after the detail view with a list is pushed on screen, as shown here <a href="https://youtu.be/LU9uluD5hEw" rel="nofollow noreferrer">https://youtu.be/LU9uluD5hEw</a>. </p>
  
  <p>If I include a section with a header, the view does not jerk up after the screen is loaded, but remains in its originally presented position. Anybody else experiencing this problem, or know how to fix it? </p>
  
  <pre><code>struct ContentView: View {
  
      var body: some View {
          NavigationView {
              List {
                  NavigationLink(destination: DetailView()) {
                      Text("Link")
                  }
              }
              .navigationBarTitle("Master")
              .listStyle(GroupedListStyle())
          }
      }
  }
  
  struct DetailView: View {
      var body: some View {
          List {
              Text("Detail")
          }
          .navigationBarTitle("Detail")
          .listStyle(GroupedListStyle())
      }
  }
  </code></pre>
  
  <p>This is especially annoying for picker details where I cannot add an empty section header as a workaround. </p>