Fix dispose on MediaElement on Windows (#1304)

added handler to dispose the windows view on the right moment

Co-authored-by: Brandon Minnick <[email protected]>

src/CommunityToolkit.Maui.MediaElement/Handlers/MediaElementHandler.windows.cs

@@ -32,7 +32,27 @@ protected override MauiMediaElement CreatePlatformView()
 	protected override void DisconnectHandler(MauiMediaElement platformView)
 	{
 		Dispose();
-		platformView.Dispose();
+		UnloadPlatformView(platformView);
 		base.DisconnectHandler(platformView);
 	}
+
+	static void UnloadPlatformView(MauiMediaElement platformView)
+	{
+		if (platformView.IsLoaded)
+		{
+			platformView.Unloaded += OnPlatformViewUnloaded;
+		}
+		else
+		{
+			platformView.Dispose();
+		}
+
+		static void OnPlatformViewUnloaded(object sender, Microsoft.UI.Xaml.RoutedEventArgs e)
+		{
+			var mediaElement = (MauiMediaElement)sender;
+
+			mediaElement.Unloaded -= OnPlatformViewUnloaded;
+			mediaElement.Dispose();
+		}
+	}
 }