Use ProcessExit to cleanup the native resources

native/Avalonia.Native/src/OSX/main.mm

@@ -198,7 +198,8 @@ class AvaloniaNative : public ComSingleObject<IAvaloniaNativeFactory, &IID_IAval
 public:
     FORWARD_IUNKNOWN()
     
-    virtual ~AvaloniaNative() override {
+    virtual ~AvaloniaNative() override
+    {
         ReleaseAvnAppEvents();
         _deallocator = nullptr;
         _dispatcher = nullptr;

src/Avalonia.Native/AvaloniaNativePlatform.cs

@@ -162,12 +162,12 @@ namespace Avalonia.Native
 
             Compositor = new Compositor(_platformGraphics, true);
 
-            Dispatcher.UIThread.ShutdownFinished += OnDispatcherShutdownFinished;
+            AppDomain.CurrentDomain.ProcessExit += OnProcessExit;
         }
 
-        private void OnDispatcherShutdownFinished(object? sender, EventArgs e)
+        private void OnProcessExit(object? sender, EventArgs e)
         {
-            Dispatcher.UIThread.ShutdownFinished -= OnDispatcherShutdownFinished;
+            AppDomain.CurrentDomain.ProcessExit -= OnProcessExit;
             _factory.Dispose();
         }