Fix broken Window menu and ResetLayout

ILSpy/Docking/DockWorkspace.cs

@@ -25,6 +25,7 @@
 using System.Reflection;
 using System.Threading;
 using System.Threading.Tasks;
+using System.Windows.Data;
 using System.Windows.Threading;
 
 using AvalonDock;
@@ -50,6 +51,7 @@ public class DockWorkspace : ObservableObject, ILayoutUpdateStrategy
 		private readonly IExportProvider exportProvider;
 
 		private readonly ObservableCollection<TabPageModel> tabPages = [];
+		private ReadOnlyCollection<ToolPaneModel> toolPanes;
 
 		readonly SessionSettings sessionSettings;
 
@@ -123,9 +125,11 @@ public void AddTabPage(TabPageModel tabPage = null)
 
 		public ReadOnlyObservableCollection<TabPageModel> TabPages { get; }
 
-		private ToolPaneModel[] toolPanes = [];
-
-		public ReadOnlyCollection<ToolPaneModel> ToolPanes => toolPanes.AsReadOnly();
+		public ReadOnlyCollection<ToolPaneModel> ToolPanes => toolPanes ??= exportProvider
+			.GetExportedValues<ToolPaneModel>("ToolPane")
+			.OrderBy(item => item.Title)
+			.ToArray()
+			.AsReadOnly();
 
 		public bool ShowToolPane(string contentId)
 		{
@@ -181,12 +185,6 @@ public void InitializeLayout()
 				AddTabPage();
 			}
 
-			toolPanes = exportProvider
-				.GetExportedValues<ToolPaneModel>("ToolPane")
-				.OrderBy(item => item.Title)
-				.ToArray();
-			OnPropertyChanged(nameof(ToolPanes));
-
 			DockingManager.LayoutUpdateStrategy = this;
 			XmlLayoutSerializer serializer = new XmlLayoutSerializer(DockingManager);
 			serializer.LayoutSerializationCallback += LayoutSerializationCallback;
@@ -198,6 +196,9 @@ public void InitializeLayout()
 			{
 				serializer.LayoutSerializationCallback -= LayoutSerializationCallback;
 			}
+
+			DockingManager.SetBinding(DockingManager.AnchorablesSourceProperty, new Binding(nameof(ToolPanes)));
+			DockingManager.SetBinding(DockingManager.DocumentsSourceProperty, new Binding(nameof(TabPages)));
 		}
 
 		void LayoutSerializationCallback(object sender, LayoutSerializationCallbackEventArgs e)

ILSpy/MainWindow.xaml

@@ -67,8 +67,6 @@
 
 		<avalondock:DockingManager x:Name="DockManager"
 								   DataContext="{Binding Workspace}"
-								   AnchorablesSource="{Binding ToolPanes}"
-								   DocumentsSource="{Binding TabPages}"
 								   ActiveContent="{Binding ActiveTabPage, Mode=TwoWay, Converter={docking:TabPageGuardConverter}}"
 								   AllowMixedOrientation="True">