Fix main window null when checking exiting

Flow.Launcher/App.xaml.cs

@@ -32,7 +32,7 @@
         #region Public Properties
 
         public static IPublicAPI API { get; private set; }
-        public static bool Exiting => _mainWindow.CanClose;
+        public static bool LoadingOrExiting => _mainWindow == null || _mainWindow.CanClose;
 
         #endregion
 
@@ -114,9 +114,9 @@
             // Initialize the public API and Settings first
             try
             {
                 API = Ioc.Default.GetRequiredService<IPublicAPI>();
                 _settings.Initialize();
                 _mainVM = Ioc.Default.GetRequiredService<MainViewModel>();
             }
             catch (Exception e)
             {
@@ -171,7 +171,7 @@
                 Current.Resources["SettingWindowFont"] = new FontFamily(_settings.SettingWindowFont);
                 Current.Resources["ContentControlThemeFontFamily"] = new FontFamily(_settings.SettingWindowFont);
 
                 Ioc.Default.GetRequiredService<Portable>().PreStartCleanUpAfterPortabilityUpdate();
 
                 API.LogInfo(ClassName, "Begin Flow Launcher startup ----------------------------------------------------");
                 API.LogInfo(ClassName, $"Runtime info:{ErrorReporting.RuntimeInfo()}");
@@ -187,7 +187,7 @@
                 PluginManager.LoadPlugins(_settings.PluginSettings);
 
                 // Register ResultsUpdated event after all plugins are loaded
                 Ioc.Default.GetRequiredService<MainViewModel>().RegisterResultsUpdatedEvent();
 
                 Http.Proxy = _settings.Proxy;
 
@@ -196,7 +196,7 @@
                 // Change language after all plugins are initialized because we need to update plugin title based on their api
                 await Ioc.Default.GetRequiredService<Internationalization>().InitializeLanguageAsync();
 
                 await imageLoadertask;
 
                 _mainWindow = new MainWindow();
 
@@ -222,7 +222,7 @@
             });
         }
 
 #pragma warning restore VSTHRD100 // Avoid async void methods
 
         /// <summary>
         /// Check startup only for Release

Flow.Launcher/SettingWindow.xaml.cs

@@ -82,7 +82,7 @@ private void OnClosed(object sender, EventArgs e)
         _viewModel.PropertyChanged -= ViewModel_PropertyChanged;
 
         // If app is exiting, settings save is not needed because main window closing event will handle this
-        if (App.Exiting) return;
+        if (App.LoadingOrExiting) return;
         // Save settings when window is closed
         _settings.Save();
         App.API.SavePluginSettings();

Flow.Launcher/ViewModel/MainViewModel.cs

@@ -1724,12 +1724,12 @@
 
         #region Public Methods
 
 #pragma warning disable VSTHRD100 // Avoid async void methods
 
         public void Show()
         {
             // When application is exiting, we should not show the main window
-            if (App.Exiting) return;
+            if (App.LoadingOrExiting) return;
 
             // When application is exiting, the Application.Current will be null
             Application.Current?.Dispatcher.Invoke(() =>
@@ -1842,7 +1842,7 @@
             VisibilityChanged?.Invoke(this, new VisibilityChangedEventArgs { IsVisible = false });
         }
 
 #pragma warning restore VSTHRD100 // Avoid async void methods
 
         /// <summary>
         /// Save history, user selected records and top most records

Flow.Launcher/WelcomeWindow.xaml.cs

@@ -96,7 +96,7 @@ private void ContentFrame_Loaded(object sender, RoutedEventArgs e)
         private void Window_Closed(object sender, EventArgs e)
         {
             // If app is exiting, settings save is not needed because main window closing event will handle this
-            if (App.Exiting) return;
+            if (App.LoadingOrExiting) return;
             // Save settings when window is closed
             _settings.Save();
         }