fix(macos): Bring window to top when activated

(cherry picked from commit 6f1da0e)

src/Uno.UI.Runtime.Skia.MacOS/MacOSWindowWrapper.cs

@@ -37,6 +37,18 @@ public override string Title
 		set => NativeUno.uno_window_set_title(_window.Handle, value);
 	}
 
+	public override void Activate()
+	{
+		NativeUno.uno_window_activate(_window.Handle);
+	}
+
+	protected override void ShowCore()
+	{
+		// the first call to `Window.Activate` does not reach the above `Activate` method
+		// https://github.com/unoplatform/uno/blob/fc8e58d77f8cf31d651135c22ea3105099c26fb7/src/Uno.UI/UI/Xaml/Window/Implementations/BaseWindowImplementation.cs#L81-L98
+		NativeUno.uno_window_activate(_window.Handle);
+	}
+
 	private void OnHostSizeChanged(Size size)
 	{
 		Bounds = new Rect(default, size);

src/Uno.UI.Runtime.Skia.MacOS/NativeUno.cs

@@ -201,6 +201,9 @@ internal static unsafe partial void uno_set_window_events_callbacks(
 	[LibraryImport("libUnoNativeMac.dylib")]
 	internal static partial nint uno_window_create(double width, double height);
 
+	[LibraryImport("libUnoNativeMac.dylib")]
+	internal static partial void uno_window_activate(nint window);
+
 	[LibraryImport("libUnoNativeMac.dylib")]
 	internal static partial void uno_window_invalidate(nint window);
 

src/Uno.UI.Runtime.Skia.MacOS/UnoNativeMac/UnoNativeMac/UNOWindow.h

@@ -40,6 +40,7 @@ void uno_set_resize_callback(resize_fn_ptr p);
 NSWindow* uno_app_get_main_window(void);
 
 NSWindow* uno_window_create(double width, double height);
+void uno_window_activate(NSWindow *window);
 void uno_window_invalidate(NSWindow *window);
 bool uno_window_resize(NSWindow *window, double width, double height);
 

src/Uno.UI.Runtime.Skia.MacOS/UnoNativeMac/UnoNativeMac/UNOWindow.m

@@ -126,6 +126,14 @@ - (void) applicationDidChangeScreenParametersNotification:(NSNotification*) note
     return window;
 }
 
+void uno_window_activate(NSWindow *window)
+{
+#if DEBUG
+    NSLog(@"uno_window_activate %@", window);
+#endif
+    [window orderFront:nil];
+}
+
 void uno_window_notify_screen_change(NSWindow *window)
 {
     assert(windowDidChangeScreen);