Add Window menu commands.

ILSpy/Docking/CloseAllDocumentsCommand.cs

@@ -0,0 +1,27 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using ICSharpCode.ILSpy.Properties;
+
+namespace ICSharpCode.ILSpy.Docking
+{
+	[ExportMainMenuCommand(Header = nameof(Resources.Window_CloseAllDocuments), Menu = nameof(Resources._Window))]
+	class CloseAllDocumentsCommand : SimpleCommand
+	{
+		public override void Execute(object parameter)
+		{
+			DockWorkspace.Instance.CloseAllDocuments();
+		}
+	}
+
+	[ExportMainMenuCommand(Header = nameof(Resources.Window_ResetLayout), Menu = nameof(Resources._Window))]
+	class ResetLayoutCommand : SimpleCommand
+	{
+		public override void Execute(object parameter)
+		{
+			DockWorkspace.Instance.ResetLayout();
+		}
+	}
+}

ILSpy/Docking/DockLayoutSettings.cs

@@ -63,6 +63,11 @@ namespace ICSharpCode.ILSpy.Docking
 
 		public bool Valid => rawSettings != null;
 
+		public void Reset()
+		{
+			this.rawSettings = DefaultLayout;
+		}
+
 		public DockLayoutSettings(XElement element)
 		{
 			if ((element != null) && element.HasElements) {

ILSpy/Docking/DockWorkspace.cs

@@ -98,8 +98,6 @@ namespace ICSharpCode.ILSpy.Docking
 			} finally {
 				serializer.LayoutSerializationCallback -= LayoutSerializationCallback;
 			}
-
-			EnsureUnclosablePanes();
 		}
 
 		void LayoutSerializationCallback(object sender, LayoutSerializationCallbackEventArgs e)
@@ -136,11 +134,6 @@ namespace ICSharpCode.ILSpy.Docking
 			}
 		}
 
-		internal void EnsureUnclosablePanes()
-		{
-			AssemblyListPaneModel.Instance.IsVisible = true;
-		}
-
 		protected void RaisePropertyChanged([CallerMemberName] string propertyName = null)
 		{
 			PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
@@ -186,5 +179,22 @@ namespace ICSharpCode.ILSpy.Docking
 				}
 			}
 		}
+
+		internal void CloseAllDocuments()
+		{
+			foreach (var doc in Documents.ToArray()) {
+				if (doc.IsCloseable)
+					Documents.Remove(doc);
+			}
+		}
+
+		internal void ResetLayout()
+		{
+			foreach (var pane in ToolPanes) {
+				pane.IsVisible = false;
+			}
+			sessionSettings.DockLayout.Reset();
+			InitializeLayout(MainWindow.Instance.DockManager);
+		}
 	}
 }

ILSpy/ILSpy.csproj

@@ -140,6 +140,7 @@
       <DependentUpon>DebugSteps.xaml</DependentUpon>
     </Compile>
     <Compile Include="Docking\ActiveDocumentConverter.cs" />
+    <Compile Include="Docking\CloseAllDocumentsCommand.cs" />
     <Compile Include="ViewModels\AssemblyListPaneModel.cs" />
     <Compile Include="Docking\DockLayoutSettings.cs" />
     <Compile Include="ViewModels\DocumentModel.cs" />

ILSpy/MainWindow.xaml

@@ -99,6 +99,7 @@
 				<MenuItem Header="{x:Static properties:Resources.Show_internalTypesMembers}" IsCheckable="True" IsChecked="{Binding SessionSettings.FilterSettings.ApiVisPublicAndInternal}" />
 				<MenuItem Header="{x:Static properties:Resources.Show_allTypesAndMembers}" IsCheckable="True" IsChecked="{Binding SessionSettings.FilterSettings.ApiVisAll}" />
 			</MenuItem>
+			<MenuItem Header="{x:Static properties:Resources._Window}" />
 		</Menu>
 		<!-- ToolBar -->
 		<ToolBar

ILSpy/Properties/Resources.Designer.cs

@@ -267,6 +267,15 @@ namespace ICSharpCode.ILSpy.Properties {
             }
         }
         
+        /// <summary>
+        ///   Looks up a localized string similar to _Window.
+        /// </summary>
+        public static string _Window {
+            get {
+                return ResourceManager.GetString("_Window", resourceCulture);
+            }
+        }
+        
         /// <summary>
         ///   Looks up a localized string similar to About.
         /// </summary>
@@ -2051,5 +2060,23 @@ namespace ICSharpCode.ILSpy.Properties {
                 return ResourceManager.GetString("WatermarkText", resourceCulture);
             }
         }
+        
+        /// <summary>
+        ///   Looks up a localized string similar to Close all documents.
+        /// </summary>
+        public static string Window_CloseAllDocuments {
+            get {
+                return ResourceManager.GetString("Window_CloseAllDocuments", resourceCulture);
+            }
+        }
+        
+        /// <summary>
+        ///   Looks up a localized string similar to Reset layout.
+        /// </summary>
+        public static string Window_ResetLayout {
+            get {
+                return ResourceManager.GetString("Window_ResetLayout", resourceCulture);
+            }
+        }
     }
 }

ILSpy/Properties/Resources.resx

@@ -781,4 +781,13 @@ Are you sure you want to continue?</value>
   <data name="Assemblies" xml:space="preserve">
     <value>Assemblies</value>
   </data>
+  <data name="Window_CloseAllDocuments" xml:space="preserve">
+    <value>Close all documents</value>
+  </data>
+  <data name="Window_ResetLayout" xml:space="preserve">
+    <value>Reset layout</value>
+  </data>
+  <data name="_Window" xml:space="preserve">
+    <value>_Window</value>
+  </data>
 </root>