Disable pointer hover on mobile platforms (#1500)

src/MAUI/Maui.Samples/Views/CategoryPage.xaml.cs

@@ -60,8 +60,10 @@ private async void SearchClicked(object sender, EventArgs e)
  await Navigation.PushAsync(new SearchPage(), false);
  }
 
+ // The favorites icon can flicker when using a pen as pointer.
  private void PointerGestureRecognizer_PointerEntered(object sender, PointerEventArgs e)
  {
+#if WINDOWS || MACCATALYST
  var view = (Border)sender;
 
  var grid = (Grid)view.Content;
@@ -71,10 +73,12 @@ private void PointerGestureRecognizer_PointerEntered(object sender, PointerEvent
  imageButton.IsVisible = true;
 
  Console.WriteLine("PointerRecognized");
+#endif
  }
 
  private void PointerGestureRecognizer_PointerExited(object sender, PointerEventArgs e)
  {
+ #if WINDOWS || MACCATALYST
  var view = (Border)sender;
 
  var grid = (Grid)view.Content;
@@ -84,6 +88,7 @@ private void PointerGestureRecognizer_PointerExited(object sender, PointerEventA
  string sampleName = (string)imageButton.CommandParameter;
 
  imageButton.IsVisible = false || SampleManager.Current.IsSampleFavorited(sampleName);
+#endif
  }
 
  protected override void OnNavigatedTo(NavigatedToEventArgs args)