chore: Continued adjusting

src/Uno.UI/UI/Xaml/Application.Android.cs

@@ -11,7 +11,7 @@ using Microsoft.UI.Xaml.Controls.Primitives;
 
 namespace Microsoft.UI.Xaml;
 
-public partial class Application
+partial class Application
 {
 	partial void InitializePartial()
 	{

src/Uno.UI/UI/Xaml/Application.iOS.cs

@@ -23,7 +23,7 @@ using LaunchActivatedEventArgs = Windows.ApplicationModel.Activation.LaunchActiv
 namespace Microsoft.UI.Xaml
 {
 	[Register("UnoAppDelegate")]
-	public partial class Application : UIApplicationDelegate
+	partial class Application : UIApplicationDelegate
 	{
 		private bool _preventSecondaryActivationHandling;
 

src/Uno.UI/UI/Xaml/Application.macOS.cs

@@ -25,7 +25,7 @@ using NativeHandle = ObjCRuntime.NativeHandle;
 namespace Microsoft.UI.Xaml
 {
 	[Register("UnoAppDelegate")]
-	public partial class Application : NSApplicationDelegate
+	partial class Application : NSApplicationDelegate
 	{
 		private NSUrl[] _launchUrls;
 

src/Uno.UI/UI/Xaml/Application.skia.cs

@@ -12,97 +12,90 @@ using Microsoft.UI.Xaml.Media;
 using Uno.UI.Dispatching;
 using Uno.UI.Xaml.Core;
 
-namespace Microsoft.UI.Xaml
+namespace Microsoft.UI.Xaml;
+
+partial class Application
 {
-	public partial class Application : IApplicationEvents
+	private static bool _startInvoked;
+
+	[ThreadStatic]
+	private static Application _current;
+
+	partial void InitializePartial()
 	{
-		private static bool _startInvoked;
-
-		[ThreadStatic]
-		private static Application _current;
-
-		partial void InitializePartial()
+		if (!_startInvoked)
 		{
-			if (!_startInvoked)
+			throw new InvalidOperationException("The application must be started using Application.Start first, e.g. Microsoft.UI.Xaml.Application.Start(_ => new App());");
+		}
+
+		SetCurrentLanguage();
+
+		CoreApplication.SetInvalidateRender(compositionTarget =>
+		{
+			Debug.Assert(compositionTarget is null or CompositionTarget);
+
+			if (compositionTarget is CompositionTarget { Root: { } root })
 			{
-				throw new InvalidOperationException("The application must be started using Application.Start first, e.g. Microsoft.UI.Xaml.Application.Start(_ => new App());");
-			}
-
-			SetCurrentLanguage();
-
-			CoreApplication.SetInvalidateRender(compositionTarget =>
-			{
-				Debug.Assert(compositionTarget is null or CompositionTarget);
-
-				if (compositionTarget is CompositionTarget { Root: { } root })
+				foreach (var cRoot in CoreServices.Instance.ContentRootCoordinator.ContentRoots)
 				{
-					foreach (var cRoot in CoreServices.Instance.ContentRootCoordinator.ContentRoots)
+					if (cRoot?.XamlRoot is { } xRoot && ReferenceEquals(xRoot.VisualTree.RootElement.Visual, root))
 					{
-						if (cRoot?.XamlRoot is { } xRoot && ReferenceEquals(xRoot.VisualTree.RootElement.Visual, root))
-						{
-							xRoot.QueueInvalidateRender();
-							return;
-						}
+						xRoot.QueueInvalidateRender();
+						return;
 					}
 				}
-			});
-		}
-
-		internal ISkiaApplicationHost? Host { get; set; }
-
-		internal static SynchronizationContext ApplicationSynchronizationContext { get; private set; }
-
-		private void SetCurrentLanguage()
-		{
-			if (CultureInfo.CurrentUICulture.IetfLanguageTag == "" &&
-				CultureInfo.CurrentUICulture.TwoLetterISOLanguageName == "iv")
-			{
-				try
-				{
-					// Fallback to English
-					var cultureInfo = CultureInfo.CreateSpecificCulture("en");
-					CultureInfo.CurrentUICulture = cultureInfo;
-					CultureInfo.CurrentCulture = cultureInfo;
-					Thread.CurrentThread.CurrentCulture = cultureInfo;
-					Thread.CurrentThread.CurrentUICulture = cultureInfo;
-				}
-				catch (Exception ex)
-				{
-					this.Log().Error($"Failed to set default culture", ex);
-				}
 			}
-		}
-
-		static partial void StartPartial()
-		{
-			_startInvoked = true;
-			SynchronizationContext.SetSynchronizationContext(
-				ApplicationSynchronizationContext = new NativeDispatcherSynchronizationContext(NativeDispatcher.Main, NativeDispatcherPriority.Normal)
-			);
-
-			callback(new ApplicationInitializationCallbackParams());
-
-			_current.InvokeOnLaunched();
-		}
-
-		private void InvokeOnLaunched()
-		{
-			using (WritePhaseEventTrace(TraceProvider.LauchedStart, TraceProvider.LauchedStop))
-			{
-				InitializationCompleted();
-
-				// OnLaunched should execute only for full apps, not for individual islands.
-				if (CoreApplication.IsFullFledgedApp)
-				{
-					OnLaunched(new LaunchActivatedEventArgs(ActivationKind.Launch, GetCommandLineArgsWithoutExecutable()));
-				}
-			}
-		}
-
-		internal void ForceSetRequestedTheme(ApplicationTheme theme) => _requestedTheme = theme;
+		});
 	}
 
-	internal interface IApplicationEvents
+	internal ISkiaApplicationHost? Host { get; set; }
+
+	internal static SynchronizationContext ApplicationSynchronizationContext { get; private set; }
+
+	private void SetCurrentLanguage()
 	{
+		if (CultureInfo.CurrentUICulture.IetfLanguageTag == "" &&
+			CultureInfo.CurrentUICulture.TwoLetterISOLanguageName == "iv")
+		{
+			try
+			{
+				// Fallback to English
+				var cultureInfo = CultureInfo.CreateSpecificCulture("en");
+				CultureInfo.CurrentUICulture = cultureInfo;
+				CultureInfo.CurrentCulture = cultureInfo;
+				Thread.CurrentThread.CurrentCulture = cultureInfo;
+				Thread.CurrentThread.CurrentUICulture = cultureInfo;
+			}
+			catch (Exception ex)
+			{
+				this.Log().Error($"Failed to set default culture", ex);
+			}
+		}
 	}
+
+	static partial void StartPartial()
+	{
+		_startInvoked = true;
+		SynchronizationContext.SetSynchronizationContext(
+			ApplicationSynchronizationContext = new NativeDispatcherSynchronizationContext(NativeDispatcher.Main, NativeDispatcherPriority.Normal)
+		);
+
+		_current.InvokeOnLaunched();
+	}
+
+	private void InvokeOnLaunched()
+	{
+		using (WritePhaseEventTrace(TraceProvider.LauchedStart, TraceProvider.LauchedStop))
+		{
+			InitializationCompleted();
+
+			// OnLaunched should execute only for full apps, not for individual islands.
+			if (CoreApplication.IsFullFledgedApp)
+			{
+				OnLaunched(new LaunchActivatedEventArgs(ActivationKind.Launch, GetCommandLineArgsWithoutExecutable()));
+			}
+		}
+	}
+
+	internal void ForceSetRequestedTheme(ApplicationTheme theme) => _requestedTheme = theme;
 }

src/Uno.UI/UI/Xaml/Application.wasm.cs

@@ -35,7 +35,7 @@ using NativeMethods = __Microsoft.UI.Xaml.Application.NativeMethods;
 
 namespace Microsoft.UI.Xaml
 {
-	public partial class Application
+	partial class Application
 	{
 		private static bool _startInvoked;