Fix navigation history

ILSpy/AssemblyTree/AssemblyTreeModel.cs

@@ -44,15 +44,15 @@ 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 System.Text;
 
 using TomsToolbox.Essentials;
 using TomsToolbox.Wpf;
-using System.Windows.Navigation;
 
 namespace ICSharpCode.ILSpy.AssemblyTree
 {
@@ -67,6 +67,7 @@ namespace ICSharpCode.ILSpy.AssemblyTree
 		AssemblyListTreeNode assemblyListTreeNode;
 
 		readonly NavigationHistory<NavigationState> history = new();
+		private bool isNavigatingHistory;
 
 		public AssemblyTreeModel()
 		{
@@ -78,7 +79,7 @@ namespace ICSharpCode.ILSpy.AssemblyTree
 			MessageBus<NavigateToReferenceEventArgs>.Subscribers += JumpToReference;
 			MessageBus<SettingsChangedEventArgs>.Subscribers += (sender, e) => Settings_PropertyChanged(sender, e);
 
-			var selectionChangeThrottle = new DispatcherThrottle(DispatcherPriority.Background, TreeView_SelectionChanged);
+			var selectionChangeThrottle = new DispatcherThrottle(DispatcherPriority.Input, TreeView_SelectionChanged);
 			SelectedItems.CollectionChanged += (_, _) => selectionChangeThrottle.Tick();
 		}
 
@@ -94,8 +95,7 @@ namespace ICSharpCode.ILSpy.AssemblyTree
 					case nameof(SessionSettings.Theme):
 						// update syntax highlighting and force reload (AvalonEdit does not automatically refresh on highlighting change)
 						DecompilerTextView.RegisterHighlighting();
-						DecompileSelectedNodes(
+						DecompileSelectedNodes(DockWorkspace.Instance.ActiveTabPage.GetState() as DecompilerTextViewState);
-							DockWorkspace.Instance.ActiveTabPage.GetState() as DecompilerTextViewState);
 						break;
 					case nameof(SessionSettings.CurrentCulture):
 						MessageBox.Show(Properties.Resources.SettingsChangeRestartRequired, "ILSpy");
@@ -107,7 +107,7 @@ namespace ICSharpCode.ILSpy.AssemblyTree
 				switch (e.PropertyName)
 				{
 					case nameof(LanguageSettings.Language) or nameof(LanguageSettings.LanguageVersion):
-						DecompileSelectedNodes(recordHistory: false);
+						DecompileSelectedNodes();
 						break;
 				}
 			}
@@ -692,6 +692,15 @@ namespace ICSharpCode.ILSpy.AssemblyTree
 		{
 			if (SelectedItems.Count > 0)
 			{
+				if (!isNavigatingHistory)
+				{
+					var activeTabPage = DockWorkspace.Instance.ActiveTabPage;
+					var currentState = activeTabPage.GetState();
+					if (currentState != null)
+						history.UpdateCurrent(new NavigationState(activeTabPage, currentState));
+					history.Record(new NavigationState(activeTabPage, SelectedItems));
+				}
+
 				var delayDecompilationRequestDueToContextMenu = Mouse.RightButton == MouseButtonState.Pressed;
 
 				if (!delayDecompilationRequestDueToContextMenu)
@@ -721,18 +730,10 @@ namespace ICSharpCode.ILSpy.AssemblyTree
 			}
 		}
 
-		public void DecompileSelectedNodes(DecompilerTextViewState newState = null, bool recordHistory = true)
+		private void DecompileSelectedNodes(DecompilerTextViewState newState = null)
 		{
 			var activeTabPage = DockWorkspace.Instance.ActiveTabPage;
 
-			if (recordHistory)
-			{
-				var currentState = activeTabPage.GetState();
-				if (currentState != null)
-					history.UpdateCurrent(new NavigationState(activeTabPage, currentState));
-				history.Record(new NavigationState(activeTabPage, SelectedItems));
-			}
-
 			activeTabPage.SupportsLanguageSwitching = true;
 
 			if (SelectedItems.Count == 1)
@@ -742,7 +743,7 @@ namespace ICSharpCode.ILSpy.AssemblyTree
 			}
 			if (newState?.ViewedUri != null)
 			{
-				MainWindow.Instance.AssemblyTreeModel.NavigateTo(new(newState.ViewedUri, null), recordHistory: false);
+				NavigateTo(new(newState.ViewedUri, null), recordHistory: false);
 				return;
 			}
 
@@ -770,6 +771,9 @@ namespace ICSharpCode.ILSpy.AssemblyTree
 
 		public void NavigateHistory(bool forward)
 		{
+			isNavigatingHistory = true;
+			this.Dispatcher.BeginInvoke(DispatcherPriority.Background, () => isNavigatingHistory = false);
+
 			TabPageModel tabPage = DockWorkspace.Instance.ActiveTabPage;
 			var state = tabPage.GetState();
 			if (state != null)
@@ -779,7 +783,6 @@ namespace ICSharpCode.ILSpy.AssemblyTree
 			DockWorkspace.Instance.ActiveTabPage = newState.TabPage;
 
 			SelectNodes(newState.TreeNodes);
-			DecompileSelectedNodes(newState.ViewState as DecompilerTextViewState, false);
 		}
 
 		public bool CanNavigateBack => history.CanNavigateBack;
@@ -802,6 +805,7 @@ namespace ICSharpCode.ILSpy.AssemblyTree
 					e.Handled = true;
 					return;
 				}
+
 				AvalonEditTextOutput output = new AvalonEditTextOutput {
 					Address = e.Uri,
 					Title = e.Uri.AbsolutePath,

ILSpy/MainWindow.xaml

@@ -37,6 +37,7 @@
 
 	<Window.InputBindings>
 		<KeyBinding Key="R" Modifiers="Control" Command="{x:Static local:ILSpyCommands.Analyze}" />
+		<KeyBinding Key="Z" Modifiers="Control" Command="{x:Static NavigationCommands.BrowseBack}" />
 	</Window.InputBindings>
 
 	<Window.TaskbarItemInfo>