Make tree roots bold

src/Avalonia.Diagnostics/Diagnostics/ViewModels/TreeNode.cs

@@ -4,24 +4,28 @@ using System.Collections.Specialized;
 using System.Reactive;
 using System.Reactive.Linq;
 using Avalonia.Controls;
+using Avalonia.Controls.Primitives;
 using Avalonia.LogicalTree;
+using Avalonia.Media;
 using Avalonia.VisualTree;
 
 namespace Avalonia.Diagnostics.ViewModels
 {
     internal abstract class TreeNode : ViewModelBase, IDisposable
     {
-        private IDisposable? _classesSubscription;
+        private readonly IDisposable? _classesSubscription;
         private string _classes;
         private bool _isExpanded;
 
-        public TreeNode(IVisual visual, TreeNode? parent)
+        protected TreeNode(IVisual visual, TreeNode? parent)
         {
             Parent = parent;
             Type = visual.GetType().Name;
             Visual = visual;
             _classes = string.Empty;
 
+            FontWeight = Visual is TopLevel or Popup ? FontWeight.Bold : FontWeight.Normal;
+
             if (visual is IControl control)
             {
                 ElementName = control.Name;
@@ -52,6 +56,8 @@ namespace Avalonia.Diagnostics.ViewModels
             }
         }
 
+        public FontWeight FontWeight { get; }
+
         public abstract TreeNodeCollection Children
         {
             get;
@@ -95,20 +101,5 @@ namespace Avalonia.Diagnostics.ViewModels
             _classesSubscription?.Dispose();
             Children.Dispose();
         }
-
-        private static int IndexOf(IReadOnlyList<TreeNode> collection, TreeNode item)
-        {
-            var count = collection.Count;
-
-            for (var i = 0; i < count; ++i)
-            {
-                if (collection[i] == item)
-                {
-                    return i;
-                }
-            }
-
-            throw new AvaloniaInternalException("TreeNode was not present in parent Children collection.");
-        }
     }
 }

src/Avalonia.Diagnostics/Diagnostics/Views/TreePageView.xaml

@@ -11,7 +11,7 @@
         <TreeDataTemplate DataType="vm:TreeNode"
                           ItemsSource="{Binding Children}">
           <StackPanel Orientation="Horizontal" Spacing="8">
-            <TextBlock Text="{Binding Type}"/>
+            <TextBlock Text="{Binding Type}" FontWeight="{Binding FontWeight}"/>
             <TextBlock Text="{Binding Classes}"/>
             <TextBlock Foreground="Gray" Text="{Binding ElementName}"/>
           </StackPanel>