Wait adorner over the decompiler view during decompile

Mirrors ILSpy/TextView/DecompilerTextView.xaml's wait-adorner shape: a
translucent overlay above the editor with a centred "Decompiling…"
title, an indeterminate ProgressBar, and a Cancel button. Visibility is
driven by a new IsDecompiling flag on DecompilerTabPageModel, set
around the Task.Run that runs the decompile. The Cancel button is
wired to a [RelayCommand] CancelDecompilation that triggers the
existing CancellationTokenSource.

Assisted-by: Claude:claude-opus-4-7:Claude Code

ILSpy/TextView/DecompilerTabPageModel.cs

@@ -27,6 +27,7 @@ using AvaloniaEdit.Folding;
 using AvaloniaEdit.Highlighting;
 
 using CommunityToolkit.Mvvm.ComponentModel;
+using CommunityToolkit.Mvvm.Input;
 
 using ICSharpCode.Decompiler;
 
@@ -68,8 +69,21 @@ namespace ILSpy.TextView
 		[ObservableProperty]
 		private IReadOnlyList<NewFolding>? foldings;
 
+		/// <summary>
+		/// True while a decompilation is in flight. The view shows an indeterminate progress bar
+		/// in the header while this is set.
+		/// </summary>
+		[ObservableProperty]
+		private bool isDecompiling;
+
 		ILSpyTreeNode? currentNode;
 
+		[RelayCommand]
+		void CancelDecompilation()
+		{
+			activeCts?.Cancel();
+		}
+
 		public ILSpyTreeNode? CurrentNode {
 			get => currentNode;
 			set {
@@ -96,12 +110,14 @@ namespace ILSpy.TextView
 			if (node == null || language == null)
 			{
 				Text = string.Empty;
+				IsDecompiling = false;
 				return;
 			}
 
-			Title = node.Text?.ToString() ?? "(unnamed)";
-			Text = "Decompiling…";
+			var nodeTitle = node.Text?.ToString() ?? "(unnamed)";
+			Title = nodeTitle;
 			SyntaxExtension = language.FileExtension;
+			IsDecompiling = true;
 
 			try
 			{
@@ -136,6 +152,7 @@ namespace ILSpy.TextView
 					HighlightingModel = model;
 					Foldings = collectedFoldings;
 					Text = rendered;
+					IsDecompiling = false;
 				});
 			}
 			catch (OperationCanceledException)

ILSpy/TextView/DecompilerTextView.axaml

@@ -5,13 +5,43 @@
              xmlns:ae="using:AvaloniaEdit"
              xmlns:textView="using:ILSpy.TextView"
              mc:Ignorable="d" d:DesignWidth="600" d:DesignHeight="400"
+             Name="self"
              x:Class="ILSpy.TextView.DecompilerTextView"
              x:DataType="textView:DecompilerTabPageModel">
 
-	<ae:TextEditor Name="Editor"
-	               IsReadOnly="True"
-	               ShowLineNumbers="True"
-	               Background="#FFFFE1"
-	               FontFamily="Consolas, Menlo, Monospace"
-	               FontSize="13" />
+	<!-- Wait-adorner pattern ported from ILSpy/TextView/DecompilerTextView.xaml: a translucent
+	     overlay above the editor with a centred title + progress bar + cancel button while a
+	     decompilation is in flight. -->
+	<Grid>
+		<ae:TextEditor Name="Editor"
+		               IsReadOnly="True"
+		               ShowLineNumbers="True"
+		               Background="#FFFFE1"
+		               FontFamily="Consolas, Menlo, Monospace"
+		               FontSize="13" />
+		<Border Name="WaitAdorner"
+		        Background="#80FFFFFF"
+		        IsVisible="{Binding IsDecompiling}">
+			<Grid ColumnDefinitions="*,Auto,*">
+				<StackPanel Grid.Column="1"
+				            VerticalAlignment="Center"
+				            HorizontalAlignment="Center">
+					<TextBlock Name="ProgressTitle"
+					           FontSize="18"
+					           Margin="3"
+					           TextWrapping="Wrap"
+					           HorizontalAlignment="Center"
+					           TextAlignment="Center"
+					           Text="Decompiling…" />
+					<ProgressBar Name="ProgressBar"
+					             IsIndeterminate="True"
+					             Height="16" />
+					<Button HorizontalAlignment="Center"
+					        Margin="3"
+					        Content="Cancel"
+					        Command="{Binding CancelDecompilationCommand}" />
+				</StackPanel>
+			</Grid>
+		</Border>
+	</Grid>
 </UserControl>