[WIP] fix: Adjusting activation to occur once the content loads

src/Uno.Extensions.Navigation.Toolkit/WindowExtensions.cs

@@ -53,7 +53,7 @@ internal static void ApplyLoadingTask(this Window window, FrameworkElement root,
 					loadingTask = new Func<Task>(async () =>
 					{
 						await navInit;
-						window.Activate();
+						window.ActivateWhenReady();
 					})();
 				}
 			}
@@ -64,7 +64,7 @@ internal static void ApplyLoadingTask(this Window window, FrameworkElement root,
 		if (activate)
 		{
 			// Activate immediately to show the splash screen
-			window.Activate();
+			window.ActivateWhenReady();
 		}
 	}
 }

src/Uno.Extensions.Navigation.UI/ServiceProviderExtensions.cs

@@ -1,5 +1,8 @@
 namespace Uno.Extensions;
 
+/// <summary>
+/// Extension methods on <see cref="ServiceProvider" />.
+/// </summary>
 public static class ServiceProviderExtensions
 {
 	/// <summary>
@@ -46,7 +49,7 @@ internal static IServiceProvider CreateNavigationScope(this IServiceProvider ser
 					.CloneScopedInstance<IDispatcher>(services);
 	}
 
-	
+
 
 	/// <summary>
 	/// Initializes navigation for an application using a ContentControl
@@ -122,11 +125,12 @@ private static async Task<IHost> BuildAndInitializeHostAsync(
 
 		await Task.Run(() => host.StartAsync());
 
-		// Fallback to make sure the window is activated
-		window.Activate();
+		window.ActivateWhenReady();
 
 		await startup;
 
 		return host;
 	}
+
+	private static void Content_Loaded(object sender, RoutedEventArgs e) => throw new NotImplementedException();
 }

src/Uno.Extensions.Navigation.UI/WindowExtensions.cs

@@ -0,0 +1,34 @@
+namespace Uno.Extensions;
+
+/// <summary>
+/// Extension methods on <see cref="Window" />.
+/// </summary>
+public static class WindowExtensions
+{
+	/// <summary>
+	/// Activates the window when the content is ready
+	/// </summary>
+	/// <param name="window">The <see cref="Window" /> to activate</param>
+	public static void ActivateWhenReady(this Window window)
+	{
+
+		if (window.Content is FrameworkElement content)
+		{
+			if (content.IsLoaded)
+			{
+				// Fallback to make sure the window is activated
+				window.Activate();
+			}
+			else
+			{
+				content.Loaded += (_, _) => window.Activate();
+				content.SizeChanged += (_, _) => window.Activate();
+				content.Loading += (_, _) => window.Activate();
+			}
+		}
+		else
+		{
+			window.Activate();
+		}
+	}
+}