code suggestions

Author: vb2ae

samples/features/Features.Avalonia/ViewModels/ShellViewModel.cs

@@ -44,7 +44,6 @@ public void GoHome()
 
         public void GoBack()
         {
-            var menuVM = _container.GetInstance<MenuViewModel>();
             if (_navigationService != null)
             {
                 _navigationService.GoBackAsync();

src/Caliburn.Micro.Platform/Platforms/netcore-avalonia/NavigationFrame.cs

@@ -122,7 +122,7 @@ private void NavigateToViewModel(object viewModel, bool addToStack = true)
             if (addToStack)
             {
                 navigationStack.Add(viewModel);
-                navigationStackIndex = navigationStack.Count;
+                navigationStackIndex = navigationStack.Count - 1;
             }
         }
 
@@ -133,7 +133,7 @@ public Task GoBackAsync(bool animated = true)
             if (navigationStackIndex > 0)
                 navigationStackIndex--;
 
-            NavigateToViewModel(navigationStack[navigationStackIndex - 1], false);
+            NavigateToViewModel(navigationStack[navigationStackIndex], false);
             return Task.CompletedTask;
         }