Use correct role for combobox items on OSX.

native/Avalonia.Native/src/OSX/automation.mm

@@ -75,6 +75,7 @@ public:
         case AutomationCalendar: return NSAccessibilityGridRole;
         case AutomationCheckBox: return NSAccessibilityCheckBoxRole;
         case AutomationComboBox: return NSAccessibilityPopUpButtonRole;
+        case AutomationComboBoxItem: return NSAccessibilityMenuItemRole;
         case AutomationEdit: return NSAccessibilityTextFieldRole;
         case AutomationHyperlink: return NSAccessibilityLinkRole;
         case AutomationImage: return NSAccessibilityImageRole;

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

@@ -13,6 +13,7 @@ namespace Avalonia.Automation.Peers
         Calendar,
         CheckBox,
         ComboBox,
+        ComboBoxItem,
         Edit,
         Hyperlink,
         Image,

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

@@ -0,0 +1,24 @@
+using System;
+using Avalonia.Automation.Platform;
+using Avalonia.Automation.Provider;
+using Avalonia.Controls;
+using Avalonia.Controls.Primitives;
+using Avalonia.Controls.Selection;
+
+#nullable enable
+
+namespace Avalonia.Automation.Peers
+{
+    public class ComboBoxItemAutomationPeer : ListItemAutomationPeer
+    {
+        public ComboBoxItemAutomationPeer(IAutomationNodeFactory factory, ComboBoxItem owner)
+            : base(factory, owner)
+        {
+        }
+
+        protected override AutomationControlType GetAutomationControlTypeCore()
+        {
+            return AutomationControlType.ComboBoxItem;
+        }
+    }
+}

src/Avalonia.Controls/ComboBoxItem.cs

@@ -1,5 +1,7 @@
 using System;
 using System.Reactive.Linq;
+using Avalonia.Automation.Peers;
+using Avalonia.Automation.Platform;
 
 namespace Avalonia.Controls
 {
@@ -13,5 +15,10 @@ namespace Avalonia.Controls
             this.GetObservable(ComboBoxItem.IsFocusedProperty).Where(focused => focused)
                 .Subscribe(_ => (Parent as ComboBox)?.ItemFocused(this));
         }
+
+        protected override AutomationPeer OnCreateAutomationPeer(IAutomationNodeFactory factory)
+        {
+            return new ComboBoxItemAutomationPeer(factory, this);
+        }
     }
 }

src/Avalonia.Native/avn.idl

@@ -414,6 +414,7 @@ enum AvnAutomationControlType
     AutomationCalendar,
     AutomationCheckBox,
     AutomationComboBox,
+    AutomationComboBoxItem,
     AutomationEdit,
     AutomationHyperlink,
     AutomationImage,

src/Windows/Avalonia.Win32/Automation/AutomationNode.cs

@@ -299,6 +299,7 @@ namespace Avalonia.Win32.Automation
                 AutomationControlType.Calendar => UiaControlTypeId.Calendar,
                 AutomationControlType.CheckBox => UiaControlTypeId.CheckBox,
                 AutomationControlType.ComboBox => UiaControlTypeId.ComboBox,
+                AutomationControlType.ComboBoxItem => UiaControlTypeId.ListItem,
                 AutomationControlType.Edit => UiaControlTypeId.Edit,
                 AutomationControlType.Hyperlink => UiaControlTypeId.Hyperlink,
                 AutomationControlType.Image => UiaControlTypeId.Image,