Adds the 'IsNonVisibleItem' property to the 'SolutionItem' class.

src/toolkit/Community.VisualStudio.Toolkit.Shared/Helpers/IVsHierarchyItem.cs

@@ -0,0 +1,43 @@
+using Microsoft.VisualStudio.Shell;
+using Microsoft.VisualStudio.Shell.Interop;
+
+namespace Community.VisualStudio.Toolkit.Shared.Helpers
+{
+    /// <summary>
+    /// Extensions for the <see cref="IVsHierarchyItem"/> interface.
+    /// </summary>
+    public static class VsHierarchyExtensions
+    {
+        /// <summary>
+        /// Returns the <see cref="IVsHierarchy"/> for the <see cref="IVsHierarchyItemIdentity"/>
+        /// </summary>
+        /// <param name="item"></param>
+        /// <returns></returns>
+        public static IVsHierarchy GetHierarchy(this IVsHierarchyItemIdentity item) =>
+            item.IsNestedItem ? item.NestedHierarchy : item.Hierarchy;
+
+        /// <summary>
+        /// Returns the 'ItemId' for the <see cref="IVsHierarchyItemIdentity"/>
+        /// </summary>
+        /// <param name="item"></param>
+        /// <returns></returns>
+        public static uint GetItemId(this IVsHierarchyItemIdentity item) =>
+            item.IsNestedItem ? item.NestedItemID : item.ItemID;
+
+        /// <summary>
+        /// Returns the <see cref="IVsHierarchy"/> for the <see cref="IVsHierarchyItem"/>
+        /// </summary>
+        /// <param name="item"></param>
+        /// <returns></returns>
+        public static IVsHierarchy GetHierarchy(this IVsHierarchyItem item) =>
+            item.HierarchyIdentity.GetHierarchy();
+
+        /// <summary>
+        /// Returns the 'ItemId' for the <see cref="IVsHierarchyItem"/>
+        /// </summary>
+        /// <param name="item"></param>
+        /// <returns></returns>
+        public static uint GetItemId(this IVsHierarchyItem item) =>
+            item.HierarchyIdentity.GetItemId();
+    }
+}

src/toolkit/Community.VisualStudio.Toolkit.Shared/Solution/SolutionItem.cs

@@ -3,7 +3,7 @@
 using System.Diagnostics;
 using System.Linq;
 using System.Threading.Tasks;
-using System.Windows.Automation.Peers;
+using Community.VisualStudio.Toolkit.Shared.Helpers;
 using Microsoft.Internal.VisualStudio.PlatformUI;
 using Microsoft.VisualStudio;
 using Microsoft.VisualStudio.Shell;
@@ -23,6 +23,7 @@ public class SolutionItem
         private IVsHierarchy _hierarchy = default!; // Initialized to non-null via the `Update()` method.
         private string? _fullPath;
         private uint _itemId;
+        private Lazy<bool> _isNonVisibleItem = default!; // Initialized to non-null via the `Update()` method.
 
         /// <summary>
         /// Creates a new instance of the solution item.
@@ -38,9 +39,18 @@ internal void Update(IVsHierarchyItem item)
         {
             ThreadHelper.ThrowIfNotOnUIThread();
             _item = item;
-            _hierarchy = item.HierarchyIdentity.IsNestedItem ? item.HierarchyIdentity.NestedHierarchy : item.HierarchyIdentity.Hierarchy;
-            _itemId = item.HierarchyIdentity.IsNestedItem ? item.HierarchyIdentity.NestedItemID : item.HierarchyIdentity.ItemID;
+            _hierarchy = item.GetHierarchy();
+            _itemId = item.GetItemId();
             _fullPath = GetFullPath();
+            _isNonVisibleItem = new Lazy<bool>(() =>
+            {
+                if (HierarchyUtilities.TryGetHierarchyProperty(_hierarchy, _itemId, (int)__VSHPROPID.VSHPROPID_IsNonMemberItem, out bool isNonMemberItem)
+                && isNonMemberItem)
+                {
+                    return isNonMemberItem;
+                }
+                return false;
+            });
         }
 
         /// <summary>
@@ -73,6 +83,11 @@ internal void Update(IVsHierarchyItem item)
         /// </summary>
         public IEnumerable<SolutionItem?> Children => _children ??= _item.Children.Select(t => FromHierarchyItem(t));
 
+        /// <summary>
+        /// Returns whether the item is normally visible in soltuion explorer
+        /// </summary>
+        public bool IsNonVisibleItem => _isNonVisibleItem.Value;
+
         /// <summary>
         /// Gets information from the underlying data types.
         /// </summary>
@@ -128,7 +143,7 @@ public void GetItemInfo(out IVsHierarchy hierarchy, out uint itemId, out IVsHier
             {
                 throw new ArgumentNullException(nameof(hierarchy));
             }
-            
+
             ThreadHelper.ThrowIfNotOnUIThread();
             IVsHierarchyItem item = hierarchy.ToHierarchyItem(itemId);
 

src/toolkit/Community.VisualStudio.Toolkit.Shared/VSSDK.Helpers.Shared.projitems

@@ -10,6 +10,7 @@
   </PropertyGroup>
   <ItemGroup>
     <Compile Include="$(MSBuildThisFileDirectory)Debugger\Debugger.cs" />
+    <Compile Include="$(MSBuildThisFileDirectory)Helpers\IVsHierarchyItem.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Windows\IToolWindowPaneAware.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Windows\ToolkitToolWindowPane.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)\Attributes\ProvideBraceCompletionAttribute.cs" />