Improve debug UI

ICSharpCode.Decompiler/IL/Instructions/ILFunction.cs

@@ -83,7 +83,11 @@ namespace ICSharpCode.Decompiler.IL
 			this.CheckInvariant(ILPhase.Normal);
 			foreach (var transform in transforms) {
 				context.CancellationToken.ThrowIfCancellationRequested();
-				context.Stepper.StartGroup(transform.GetType().Name);
+				if (transform is BlockILTransform blockTransform) {
+					context.Stepper.StartGroup(blockTransform.ToString());
+				} else {
+					context.Stepper.StartGroup(transform.GetType().Name);
+				}
 				transform.Run(this, context);
 				this.CheckInvariant(ILPhase.Normal);
 				context.Stepper.EndGroup(keepIfEmpty: true);

ICSharpCode.Decompiler/IL/Transforms/BlockTransform.cs

@@ -63,6 +63,11 @@ namespace ICSharpCode.Decompiler.IL.Transforms
 		public IList<IBlockTransform> PreOrderTransforms { get; } = new List<IBlockTransform>();
 		public IList<IBlockTransform> PostOrderTransforms { get; } = new List<IBlockTransform>();
 
+		public override string ToString()
+		{
+			return $"{nameof(BlockILTransform)} ({string.Join(", ", PreOrderTransforms.Concat(PostOrderTransforms).Select(t => t.GetType().Name))})";
+		}
+
 		public void Run(ILFunction function, ILTransformContext context)
 		{
 			var blockContext = new BlockTransformContext(context);

ILSpy/Languages/ILAstLanguage.cs

@@ -168,6 +168,10 @@ namespace ICSharpCode.ILSpy
 						OnStepperUpdated(new EventArgs());
 					}
 				}
+				(output as ISmartTextOutput)?.AddButton(Images.ViewCode, "Show Steps", delegate {
+					DebugSteps.Show();
+				});
+				output.WriteLine();
 				il.WriteTo(output);
 			}
 		}