Drop the redundant "Freeze current tab" main-menu entry

Freezing the preview tab is already offered by the on-tab snowflake button and
the tab's right-click "Freeze tab" entry, so the Window-menu command duplicated
an action that is more naturally invoked on the tab itself. DockWorkspace.
FreezeCurrentTab stays -- both remaining affordances call it.

Assisted-by: Claude:claude-opus-4-8:Claude Code

ILSpy/Commands/WindowCommands.cs

@@ -39,19 +39,4 @@ namespace ILSpy.Commands
 	{
 		public override void Execute(object? parameter) => dockWorkspace.ResetLayout();
 	}
-
-	/// <summary>
-	/// VS-style "promote preview tab" command. The persistent MainTab starts as preview
-	/// (its content is replaced by tree-node selections); freezing makes it a regular tab
-	/// that keeps its content, and a fresh preview MainTab takes over the
-	/// tree-selection slot. <see cref="DockWorkspace.FreezeCurrentTab"/> is a no-op when
-	/// there's nothing freezable (no MainTab, or MainTab already frozen).
-	/// </summary>
-	[ExportMainMenuCommand(Header = nameof(Resources.Window_FreezeCurrentTab), ParentMenuID = nameof(Resources._Window), MenuCategory = "Window", MenuOrder = 0)]
-	[Shared]
-	[method: ImportingConstructor]
-	sealed class FreezeCurrentTabCommand(DockWorkspace dockWorkspace) : SimpleCommand
-	{
-		public override void Execute(object? parameter) => dockWorkspace.FreezeCurrentTab();
-	}
 }

ILSpy/Properties/Resources.Designer.cs

@@ -3160,15 +3160,6 @@ namespace ICSharpCode.ILSpy.Properties {
             }
         }
 
-        /// <summary>
-        ///   Looks up a localized string similar to _Pin current tab.
-        /// </summary>
-        public static string Window_FreezeCurrentTab {
-            get {
-                return ResourceManager.GetString("Window_FreezeCurrentTab", resourceCulture);
-            }
-        }
-
         /// <summary>
         ///   Looks up a localized string similar to _Reset layout.
         /// </summary>

ILSpy/Properties/Resources.resx

@@ -1084,9 +1084,6 @@ Do you want to continue?</value>
   <data name="Window_CloseAllDocuments" xml:space="preserve">
     <value>_Close all documents</value>
   </data>
-  <data name="Window_FreezeCurrentTab" xml:space="preserve">
-    <value>_Freeze current tab</value>
-  </data>
   <data name="Window_ResetLayout" xml:space="preserve">
     <value>_Reset layout</value>
   </data>