Fix: Fixed a crash that would occur when closing the main window (#16140)

Author: yaira2

src/Files.App/App.xaml.cs

@@ -159,8 +159,6 @@ async Task ActivateAsync()
 				}
 
 				await AppLifecycleHelper.InitializeAppComponentsAsync();
-
-				AppLifecycleHelper.IsLaunchInitialized = true;
 			}
 		}
 

src/Files.App/Data/Items/WindowEx.cs

@@ -106,7 +106,6 @@ public unsafe WindowEx(int minWidth = 400, int minHeight = 300)
 			_oldWndProc = Marshal.GetDelegateForFunctionPointer<WNDPROC>(pOldWndProc);
 
 			Closed += WindowEx_Closed;
-			Activated += WindowEx_Activated; ;
 		}
 
 		private unsafe void StoreWindowPlacementData()
@@ -298,16 +297,9 @@ private void WindowEx_Closed(object sender, WindowEventArgs args)
 			StoreWindowPlacementData();
 		}
 
-		private void WindowEx_Activated(object sender, WindowActivatedEventArgs args)
-		{
-			if (AppLifecycleHelper.IsLaunchInitialized && SystemBackdrop is AppSystemBackdrop appSystemBackdrop)
-				appSystemBackdrop.SystemBackdropConfiguration.IsInputActive = args.WindowActivationState is not WindowActivationState.Deactivated;
-		}
-
 		public void Dispose()
 		{
 			Closed -= WindowEx_Closed;
-			Activated -= WindowEx_Activated;
 		}
 	}
 }

src/Files.App/Helpers/Application/AppLifecycleHelper.cs

@@ -4,7 +4,6 @@
 using CommunityToolkit.WinUI.Helpers;
 using Files.App.Helpers.Application;
 using Files.App.Services.SizeProvider;
-using Files.App.Storage.Storables;
 using Files.App.Utils.Logger;
 using Files.App.ViewModels.Settings;
 using Microsoft.Extensions.DependencyInjection;
@@ -58,12 +57,6 @@ public static class AppLifecycleHelper
 				_ => Constants.AssetPaths.StableLogo
 			});
 
-		/// <summary>
-		/// Gets or sets a value that indicates whether the application is ready to be interacted with.
-		/// This is primarily used for DI container initialization check.
-		/// </summary>
-		public static bool IsLaunchInitialized { get; set; }
-
 		/// <summary>
 		/// Initializes the app components.
 		/// </summary>

src/Files.App/Helpers/UI/AppSystemBackdrop.cs

@@ -16,8 +16,6 @@ internal sealed class AppSystemBackdrop : SystemBackdrop
 		private XamlRoot root;
 		private SystemBackdropTheme? prevTheme = null;
 
-		public SystemBackdropConfiguration SystemBackdropConfiguration { get; set; }
-
 		public AppSystemBackdrop(bool isSecondaryWindow = false)
 		{
 			this.isSecondaryWindow = isSecondaryWindow;
@@ -34,21 +32,21 @@ protected override void OnTargetConnected(ICompositionSupportsSystemBackdrop con
 			base.OnTargetConnected(connectedTarget, xamlRoot);
 			this.target = connectedTarget;
 			this.root = xamlRoot;
-			SystemBackdropConfiguration = GetDefaultSystemBackdropConfiguration(connectedTarget, xamlRoot);
-			controller = GetSystemBackdropController(userSettingsService.AppearanceSettingsService.AppThemeBackdropMaterial, SystemBackdropConfiguration.Theme);
-			controller?.SetSystemBackdropConfiguration(SystemBackdropConfiguration);
+			var configuration = GetDefaultSystemBackdropConfiguration(connectedTarget, xamlRoot);
+			controller = GetSystemBackdropController(userSettingsService.AppearanceSettingsService.AppThemeBackdropMaterial, configuration.Theme);
+			controller?.SetSystemBackdropConfiguration(configuration);
 			controller?.AddSystemBackdropTarget(connectedTarget);
 		}
 
 		protected override void OnDefaultSystemBackdropConfigurationChanged(ICompositionSupportsSystemBackdrop target, XamlRoot xamlRoot)
 		{
 			base.OnDefaultSystemBackdropConfigurationChanged(target, xamlRoot);
-			SystemBackdropConfiguration = GetDefaultSystemBackdropConfiguration(target, xamlRoot);
-			if (controller is not DesktopAcrylicController acrylicController || acrylicController.Kind != DesktopAcrylicKind.Thin || SystemBackdropConfiguration.Theme == prevTheme)
+			var configuration = GetDefaultSystemBackdropConfiguration(target, xamlRoot);
+			if (controller is not DesktopAcrylicController acrylicController || acrylicController.Kind != DesktopAcrylicKind.Thin || configuration.Theme == prevTheme)
 				return;
 
-			prevTheme = SystemBackdropConfiguration.Theme;
-			SetThinAcrylicBackdropProperties(acrylicController, SystemBackdropConfiguration.Theme);
+			prevTheme = configuration.Theme;
+			SetThinAcrylicBackdropProperties(acrylicController, configuration.Theme);
 		}
 
 		protected override void OnTargetDisconnected(ICompositionSupportsSystemBackdrop disconnectedTarget)
@@ -81,9 +79,9 @@ private void OnSettingChanged(object? sender, SettingChangedEventArgs e)
 				case nameof(IAppearanceSettingsService.AppThemeBackdropMaterial):
 					controller?.RemoveAllSystemBackdropTargets();
 					controller?.Dispose();
-					SystemBackdropConfiguration = GetDefaultSystemBackdropConfiguration(target, root);
-					var newController = GetSystemBackdropController((BackdropMaterialType)e.NewValue!, SystemBackdropConfiguration.Theme);
-					newController?.SetSystemBackdropConfiguration(SystemBackdropConfiguration);
+					var configuration = GetDefaultSystemBackdropConfiguration(target, root);
+					var newController = GetSystemBackdropController((BackdropMaterialType)e.NewValue!, configuration.Theme);
+					newController?.SetSystemBackdropConfiguration(configuration);
 					newController?.AddSystemBackdropTarget(target);
 					controller = newController;
 					break;