Add back a thin automation peer for native menu bar.

src/Avalonia.Controls/Automation/Peers/NativeMenuBarAutomationPeer.cs

@@ -0,0 +1,16 @@
+using System.Collections.Generic;
+using System.Linq;
+using Avalonia.Controls;
+using Avalonia.LogicalTree;
+using Avalonia.VisualTree;
+
+namespace Avalonia.Automation.Peers
+{
+    public class NativeMenuBarAutomationPeer(NativeMenuBar owner) : ControlAutomationPeer(owner)
+    {
+        protected override AutomationControlType GetAutomationControlTypeCore()
+        {
+            return AutomationControlType.MenuBar;
+        }
+    }
+}

src/Avalonia.Controls/NativeMenuBar.cs

@@ -1,4 +1,5 @@
 using System;
+using Avalonia.Automation.Peers;
 using Avalonia.Controls.Metadata;
 using Avalonia.Controls.Primitives;
 using Avalonia.Controls.Templates;
@@ -70,5 +71,7 @@ namespace Avalonia.Controls
                 menu.Bind(ItemsControl.ItemsSourceProperty, topLevel.GetBindingObservable(NativeMenu.MenuProperty)
                     .Select(v => v.GetValueOrDefault<NativeMenu>()?.Items)));
         }
+
+        protected override AutomationPeer OnCreateAutomationPeer() => new NativeMenuBarAutomationPeer(this);
     }
 }

tests/Avalonia.Controls.UnitTests/Automation/NativeMenuBarAutomationPeerTests.cs

@@ -0,0 +1,73 @@
+using System.Linq;
+using Avalonia;
+using Avalonia.Automation;
+using Avalonia.Automation.Peers;
+using Avalonia.Controls;
+using Avalonia.Controls.Templates;
+using Avalonia.UnitTests;
+using Avalonia.VisualTree;
+using Xunit;
+
+namespace Avalonia.Controls.UnitTests.Automation;
+
+public class NativeMenuBarAutomationPeerTests
+{
+    public class PeerCreation : ScopedTestBase
+    {
+        [Fact]
+        public void Creates_NativeMenuBarAutomationPeer()
+        {
+            var control = new NativeMenuBar { Template = CreateTemplate() };
+            var peer = ControlAutomationPeer.CreatePeerForElement(control);
+
+            Assert.IsType<NativeMenuBarAutomationPeer>(peer);
+        }
+
+        [Fact]
+        public void ControlType_Is_MenuBar()
+        {
+            var control = new NativeMenuBar { Template = CreateTemplate() };
+            var peer = (NativeMenuBarAutomationPeer)ControlAutomationPeer.CreatePeerForElement(control);
+
+            Assert.Equal(AutomationControlType.MenuBar, peer.GetAutomationControlType());
+        }
+    }
+
+    public class Children : ScopedTestBase
+    {
+        [Fact]
+        public void Exposes_Realized_MenuItems_Via_VisualChildren()
+        {
+            var control = new NativeMenuBar { Template = CreateTemplate() };
+            control.ApplyTemplate();
+            var menu = Assert.IsType<Menu>(control.GetVisualChildren().Single());
+            menu.ApplyTemplate();
+            menu.Measure(Size.Infinity);
+            menu.Arrange(new Rect(0, 0, 300, 30));
+            control.Measure(Size.Infinity);
+            control.Arrange(new Rect(0, 0, 300, 30));
+
+            var peer = (NativeMenuBarAutomationPeer)ControlAutomationPeer.CreatePeerForElement(control);
+            var presenterChildren = peer.GetChildren();
+
+            Assert.Equal(2, presenterChildren.Count);
+            Assert.All(presenterChildren, x => Assert.IsType<MenuItemAutomationPeer>(x));
+            Assert.Equal("File", presenterChildren[0].GetName());
+            Assert.Equal("Edit", presenterChildren[1].GetName());
+        }
+    }
+
+    private static FuncControlTemplate CreateTemplate()
+    {
+        return new FuncControlTemplate((_, ns) =>
+            new Menu
+            {
+                Name = "PART_NativeMenuPresenter",
+                Items =
+                {
+                    new MenuItem { Header = "File" },
+                    new MenuItem { Header = "Edit" },
+                },
+            }.RegisterInNameScope(ns));
+    }
+}