fix build errors from merge

ILSpy/App.xaml.cs

@@ -18,13 +18,14 @@
 
 using System;
 using System.Collections.Generic;
-using System.ComponentModel.Composition.Hosting;
 using System.Diagnostics;
+using System.Globalization;
 using System.IO;
 using System.Linq;
 using System.Reflection;
 using System.Runtime.Loader;
 using System.Text;
+using System.Threading;
 using System.Threading.Tasks;
 using System.Windows;
 using System.Windows.Documents;
@@ -33,8 +34,8 @@ using System.Windows.Threading;
 
 using ICSharpCode.ILSpy.AppEnv;
 using ICSharpCode.ILSpy.AssemblyTree;
+using ICSharpCode.ILSpy.Themes;
 using ICSharpCode.ILSpyX.Analyzers;
-using ICSharpCode.ILSpyX.Settings;
 using ICSharpCode.ILSpyX.TreeView;
 
 using Medo.Application;
@@ -43,9 +44,6 @@ using Microsoft.VisualStudio.Composition;
 
 using TomsToolbox.Composition;
 using TomsToolbox.Wpf.Composition;
-using ICSharpCode.ILSpy.Themes;
-using System.Globalization;
-using System.Threading;
 using TomsToolbox.Wpf.Styles;
 
 namespace ICSharpCode.ILSpy

ILSpy/AssemblyTree/AssemblyTreeModel.cs

@@ -16,40 +16,38 @@
 // OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 // DEALINGS IN THE SOFTWARE.
 
-using System.Collections.Generic;
 using System;
+using System.Collections.Generic;
 using System.Collections.ObjectModel;
+using System.Collections.Specialized;
+using System.ComponentModel;
 using System.ComponentModel.Composition;
 using System.IO;
+using System.Linq;
+using System.Reflection.Metadata;
+using System.Reflection.Metadata.Ecma335;
+using System.Text;
 using System.Threading.Tasks;
+using System.Windows;
 using System.Windows.Input;
+using System.Windows.Navigation;
 using System.Windows.Threading;
 
+using ICSharpCode.Decompiler;
+using ICSharpCode.Decompiler.Documentation;
+using ICSharpCode.Decompiler.Metadata;
 using ICSharpCode.Decompiler.TypeSystem;
+using ICSharpCode.Decompiler.TypeSystem.Implementation;
+using ICSharpCode.ILSpy.AppEnv;
 using ICSharpCode.ILSpy.Docking;
 using ICSharpCode.ILSpy.Properties;
+using ICSharpCode.ILSpy.Search;
 using ICSharpCode.ILSpy.TextView;
 using ICSharpCode.ILSpy.TreeNodes;
 using ICSharpCode.ILSpy.ViewModels;
 using ICSharpCode.ILSpyX;
 using ICSharpCode.ILSpyX.Settings;
 using ICSharpCode.ILSpyX.TreeView;
-using System.Collections.Specialized;
-using System.ComponentModel;
-using System.Linq;
-using ICSharpCode.Decompiler.Metadata;
-
-using System.Reflection.Metadata.Ecma335;
-using System.Windows;
-using ICSharpCode.Decompiler.Documentation;
-using ICSharpCode.Decompiler.TypeSystem.Implementation;
-using System.Reflection.Metadata;
-using System.Text;
-using System.Windows.Navigation;
-
-using ICSharpCode.ILSpy.AppEnv;
-using ICSharpCode.ILSpy.Search;
-using ICSharpCode.Decompiler;
 
 using TomsToolbox.Essentials;
 using TomsToolbox.Wpf;
@@ -121,8 +119,8 @@ namespace ICSharpCode.ILSpy.AssemblyTree
 			set => SetProperty(ref root, value);
 		}
 
-		private SharpTreeNode selectedItem;
-		public SharpTreeNode SelectedItem {
+		private SharpTreeNode? selectedItem;
+		public SharpTreeNode? SelectedItem {
 			get => selectedItem;
 			set => SetProperty(ref selectedItem, value);
 		}
@@ -145,7 +143,7 @@ namespace ICSharpCode.ILSpy.AssemblyTree
 		/// Called on startup or when passed arguments via WndProc from a second instance.
 		/// In the format case, spySettings is non-null; in the latter it is null.
 		/// </summary>
-		public void HandleCommandLineArgumentsAfterShowList(CommandLineArguments args, ISettingsProvider spySettings = null)
+		public void HandleCommandLineArgumentsAfterShowList(CommandLineArguments args, ISettingsProvider? spySettings = null)
 		{
 			var sessionSettings = SettingsService.Instance.SessionSettings;
 
@@ -432,7 +430,7 @@ namespace ICSharpCode.ILSpy.AssemblyTree
 #endif
 		}
 
-		void assemblyList_CollectionChanged(object sender, NotifyCollectionChangedEventArgs e)
+		void assemblyList_CollectionChanged(object? sender, NotifyCollectionChangedEventArgs e)
 		{
 			if (e.Action == NotifyCollectionChangedAction.Reset)
 			{
@@ -595,7 +593,7 @@ namespace ICSharpCode.ILSpy.AssemblyTree
 			}
 		}
 
-		private void JumpToReference(object sender, NavigateToReferenceEventArgs e)
+		private void JumpToReference(object? sender, NavigateToReferenceEventArgs e)
 		{
 			JumpToReferenceAsync(e.Reference, e.InNewTabPage).HandleExceptions();
 		}
@@ -655,11 +653,11 @@ namespace ICSharpCode.ILSpy.AssemblyTree
 
 		#endregion
 
-		public void LoadAssemblies(IEnumerable<string> fileNames, List<LoadedAssembly> loadedAssemblies = null, bool focusNode = true)
+		public void LoadAssemblies(IEnumerable<string> fileNames, List<LoadedAssembly>? loadedAssemblies = null, bool focusNode = true)
 		{
 			using (Keyboard.FocusedElement.PreserveFocus(!focusNode))
 			{
-				AssemblyTreeNode lastNode = null;
+				AssemblyTreeNode? lastNode = null;
 
 				foreach (string file in fileNames)
 				{
@@ -717,7 +715,7 @@ namespace ICSharpCode.ILSpy.AssemblyTree
 
 			return;
 
-			void ContextMenuClosed(object sender, EventArgs e)
+			void ContextMenuClosed(object? sender, EventArgs e)
 			{
 				ContextMenuProvider.ContextMenuClosed -= ContextMenuClosed;
 
@@ -730,7 +728,7 @@ namespace ICSharpCode.ILSpy.AssemblyTree
 			}
 		}
 
-		private void DecompileSelectedNodes(DecompilerTextViewState newState = null)
+		private void DecompileSelectedNodes(DecompilerTextViewState? newState = null)
 		{
 			var activeTabPage = DockWorkspace.Instance.ActiveTabPage;
 
@@ -882,7 +880,7 @@ namespace ICSharpCode.ILSpy.AssemblyTree
 		private class AssemblyComparer : IComparer<LoadedAssembly>
 		{
 			public static readonly AssemblyComparer Instance = new();
-			int IComparer<LoadedAssembly>.Compare(LoadedAssembly x, LoadedAssembly y)
+			int IComparer<LoadedAssembly>.Compare(LoadedAssembly? x, LoadedAssembly? y)
 			{
 				return string.Compare(x?.ShortName, y?.ShortName, StringComparison.CurrentCulture);
 			}

ILSpy/ContextMenuEntry.cs

@@ -90,7 +90,7 @@ namespace ICSharpCode.ILSpy
 		/// </summary>
 		public DependencyObject OriginalSource { get; private set; }
 
-		public static TextViewContext Create(ContextMenuEventArgs eventArgs, SharpTreeView?? treeView = null, DecompilerTextView textView = null, ListBox? listBox = null, DataGrid? dataGrid = null)
+		public static TextViewContext Create(ContextMenuEventArgs eventArgs, SharpTreeView? treeView = null, DecompilerTextView? textView = null, ListBox? listBox = null, DataGrid? dataGrid = null)
 		{
 			ReferenceSegment? reference;
 

ILSpy/Docking/DockWorkspace.cs

@@ -110,7 +110,7 @@ namespace ICSharpCode.ILSpy.Docking
 			}
 		}
 
-		public void AddTabPage(TabPageModel tabPage = null)
+		public void AddTabPage(TabPageModel? tabPage = null)
 		{
 			tabPages.Add(tabPage ?? new TabPageModel());
 		}

ILSpy/MainWindow.xaml.cs

@@ -29,7 +29,6 @@ using System.Windows.Media;
 using AvalonDock.Layout.Serialization;
 
 using ICSharpCode.ILSpy.AssemblyTree;
-using ICSharpCode.ILSpy.Docking;
 using ICSharpCode.ILSpy.TreeNodes;
 using ICSharpCode.ILSpy.Updates;
 using ICSharpCode.ILSpyX.FileLoaders;

ILSpy/Options/DisplaySettingsPanel.xaml.cs

@@ -69,7 +69,7 @@ namespace ICSharpCode.ILSpy.Options
 
 	public sealed class FontSizeConverter : ValueConverter
 	{
-		protected override object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
+		protected override object Convert(object value, Type? targetType, object? parameter, System.Globalization.CultureInfo? culture)
 		{
 			if (value is double d)
 			{
@@ -79,7 +79,7 @@ namespace ICSharpCode.ILSpy.Options
 			return DependencyProperty.UnsetValue;
 		}
 
-		protected override object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
+		protected override object ConvertBack(object value, Type? targetType, object? parameter, System.Globalization.CultureInfo? culture)
 		{
 			if (value is not string s)
 				return DependencyProperty.UnsetValue;

ILSpy/Options/OptionsDialog.xaml.cs

@@ -69,7 +69,7 @@ namespace ICSharpCode.ILSpy.Options
 			this.assemblyTreeModel = assemblyTreeModel;
 		}
 
-		public override void Execute(object parameter)
+		public override void Execute(object? parameter)
 		{
 			OptionsDialog dlg = new() {
 				Owner = MainWindow.Instance,

ILSpy/SessionSettings.cs

@@ -180,14 +180,14 @@ namespace ICSharpCode.ILSpy
 			return c.ConvertToInvariantString(obj);
 		}
 
-		public event PropertyChangedEventHandler PropertyChanged;
+		public event PropertyChangedEventHandler? PropertyChanged;
 
-		private void OnPropertyChanged([CallerMemberName] string propertyName = null)
+		private void OnPropertyChanged([CallerMemberName] string? propertyName = null)
 		{
 			PropertyChanged?.Invoke(this, new(propertyName));
 		}
 
-		private bool SetProperty<T>(ref T field, T value, [CallerMemberName] string propertyName = null)
+		private bool SetProperty<T>(ref T field, T value, [CallerMemberName] string? propertyName = null)
 		{
 			if (EqualityComparer<T>.Default.Equals(field, value))
 				return false;

ILSpy/Views/DebugSteps.xaml.cs

@@ -52,7 +52,7 @@ namespace ICSharpCode.ILSpy
 			DecompileAsync(lastSelectedStep);
 		}
 
-		private void SelectionChanged(object sender, EventArgs e)
+		private void SelectionChanged(object? sender, EventArgs e)
 		{
 			Dispatcher.Invoke(() => {
 				tree.ItemsSource = null;
@@ -60,7 +60,7 @@ namespace ICSharpCode.ILSpy
 			});
 		}
 
-		private void Settings_PropertyChanged(object sender, System.ComponentModel.PropertyChangedEventArgs e)
+		private void Settings_PropertyChanged(object? sender, System.ComponentModel.PropertyChangedEventArgs e)
 		{
 #if DEBUG
 			if (sender is not LanguageSettings)