Custom decorations setting actually sets decorations

SightKeeper.Avalonia/Extensions/ControlExtensions.cs

@@ -1,5 +1,7 @@
-using Avalonia;
+using System.Linq;
+using Avalonia;
 using Avalonia.Controls;
+using Avalonia.Controls.ApplicationLifetimes;
 using CommunityToolkit.Diagnostics;
 
 namespace SightKeeper.Avalonia.Extensions;
@@ -9,4 +11,23 @@ public static class ControlExtensions
 	public static TopLevel GetTopLevel(this Visual visual) =>
 		TopLevel.GetTopLevel(visual) ??
 		ThrowHelper.ThrowArgumentException<TopLevel>(nameof(visual), "Could`t find TopLevel of the visual");
+
+	public static void ReopenWindow<TWindow>() where TWindow : Window, new()
+	{
+		var application = global::Avalonia.Application.Current;
+		Guard.IsNotNull(application);
+		Guard.IsNotNull(application.ApplicationLifetime);
+		var lifetime = (IClassicDesktopStyleApplicationLifetime)application.ApplicationLifetime;
+		var window = lifetime.Windows.OfType<TWindow>().Single();
+		TWindow replacement = new()
+		{
+			Position = window.Position,
+			DataContext = window.DataContext,
+			WindowState = window.WindowState,
+			Width = window.Width,
+			Height = window.Height
+		};
+		replacement.Show();
+		window.Close();
+	}
 }

SightKeeper.Avalonia/MainViewModel.cs

@@ -4,6 +4,7 @@
 using CommunityToolkit.Mvvm.ComponentModel;
 using Material.Icons;
 using SightKeeper.Avalonia.Dialogs;
+using SightKeeper.Avalonia.Settings.Appearance;
 using SightKeeper.Avalonia.ViewModels;
 using SightKeeper.Avalonia.ViewModels.Elements;
 using SettingsViewModel = SightKeeper.Avalonia.Settings.SettingsViewModel;
@@ -13,11 +14,16 @@ namespace SightKeeper.Avalonia;
 internal sealed partial class MainViewModel : ViewModel, DialogHost
 {
 	public DialogManager DialogManager { get; }
+	public AppearanceSettingsViewModel AppearanceSettings { get; }
 	public IReadOnlyCollection<TabItem> Tabs { get; }
 
-	public MainViewModel(IComponentContext context, DialogManager dialogManager)
+	public MainViewModel(
+		IComponentContext context,
+		DialogManager dialogManager,
+		AppearanceSettingsViewModel appearanceSettings)
 	{
 		DialogManager = dialogManager;
+		AppearanceSettings = appearanceSettings;
 		Tabs =
 		[
 			CreateTab<SettingsViewModel>(context, MaterialIconKind.Cog, "Settings"),

SightKeeper.Avalonia/MainWindow.axaml

@@ -12,7 +12,8 @@
         Title="Sight Keeper"
         MinWidth="480"
         MinHeight="320"
-        x:DataType="local:MainViewModel">
+        x:DataType="local:MainViewModel"
+        ExtendClientAreaToDecorationsHint="{Binding AppearanceSettings.CustomDecorations}">
 	<assists:WindowAssist.OverlayContent>
 		<dialogs:DialogHostPresenter/>
 	</assists:WindowAssist.OverlayContent>

SightKeeper.Avalonia/Settings/Appearance/AppearanceSettingsViewModel.cs

@@ -1,4 +1,5 @@
 using System.ComponentModel;
+using SightKeeper.Avalonia.Extensions;
 using SightKeeper.Avalonia.ViewModels;
 
 namespace SightKeeper.Avalonia.Settings.Appearance;
@@ -18,7 +19,8 @@ public bool CustomDecorations
 				return;
 			_customDecorations = value;
 			OnPropertyChanged();
-
+			// ISSUE Should not directly reference window
+			ControlExtensions.ReopenWindow<MainWindow>();
 		}
 	}
 

SightKeeper.Avalonia/Setup/ViewModelsBootstrapper.cs

@@ -12,7 +12,7 @@ public static void Setup(ContainerBuilder builder)
 	{
 		builder.RegisterType<MainViewModel>();
 		builder.RegisterType<SettingsViewModel>();
-		builder.RegisterType<AppearanceSettingsViewModel>().As<SettingsSection>();
+		builder.RegisterType<AppearanceSettingsViewModel>().AsSelf().As<SettingsSection>().SingleInstance();
 		builder.RegisterType<GamesSettingsViewModel>().As<SettingsSection>();
 		builder.RegisterType<GamesRepositoryViewModel>();
 		builder.RegisterType<AddGameViewModel>();