Remove NativeMenu.PrependApplicationMenu for now

src/Avalonia.Controls/NativeMenu.Export.cs

@@ -62,15 +62,6 @@ namespace Avalonia.Controls
 
         public static void SetMenu(AvaloniaObject o, NativeMenu menu) => o.SetValue(MenuProperty, menu);
         public static NativeMenu GetMenu(AvaloniaObject o) => o.GetValue(MenuProperty);
-
-
-        public static readonly AttachedProperty<bool> PrependApplicationMenuProperty
-            = AvaloniaProperty.RegisterAttached<NativeMenu, TopLevel, Boolean>("PrependApplicationMenu");
-
-        public static void SetPrependApplicationMenu(TopLevel tl, bool value) =>
-            tl.SetValue(PrependApplicationMenuProperty, value);
-
-        public static bool GetPrependApplicationMenu(TopLevel tl) => tl.GetValue(PrependApplicationMenuProperty);
         
         static NativeMenu()
         {
@@ -89,11 +80,6 @@ namespace Avalonia.Controls
                     GetInfo(tl).Exporter?.SetNativeMenu((NativeMenu)args.NewValue);
                 }
             });
-
-            PrependApplicationMenuProperty.Changed.Subscribe(args =>
-            {
-                GetInfo((TopLevel)args.Sender).Exporter?.SetPrependApplicationMenu((bool)args.NewValue);
-            });
         }
     }
 }

src/Avalonia.Controls/Platform/ITopLevelNativeMenuExporter.cs

@@ -9,7 +9,6 @@ namespace Avalonia.Controls.Platform
         bool IsNativeMenuExported { get; }
         event EventHandler OnIsNativeMenuExportedChanged;
         void SetNativeMenu(NativeMenu menu);
-        void SetPrependApplicationMenu(bool prepend);
     }
     
     public interface ITopLevelImplWithNativeMenuExporter : ITopLevelImpl

src/Avalonia.FreeDesktop/DBusMenuExporter.cs

@@ -161,11 +161,6 @@ namespace Avalonia.FreeDesktop
                 QueueReset();
             }
 
-            public void SetPrependApplicationMenu(bool prepend)
-            {
-                // Not implemented yet :(
-            }
-
             public ObjectPath ObjectPath { get; }
 
 

src/Avalonia.Native/AvaloniaNativeMenuExporter.cs

@@ -83,11 +83,6 @@ namespace Avalonia.Native
             DoLayoutReset();
         }
 
-        public void SetPrependApplicationMenu(bool prepend)
-        {
-            // OSX always exports the app menu.
-        }
-
         private void OnItemPropertyChanged(object sender, AvaloniaPropertyChangedEventArgs e)
         {
             QueueReset();