Stabilize the headless decompile-wait tests on slow CI runners

Keep the headless UI tests from timing out on the slow Windows runner:
decompile a small CoreLib type (System.Object) in the folding and
token-history tests instead of a large one, and raise the shared
decompile-wait timeout so a cold first decompile (JIT plus building a
CoreLib-scale type system) finishes in time.

Assisted-by: Claude:claude-opus-4-8:Claude Code

ILSpy.Tests/Editor/FoldingContextMenuTests.cs

@@ -44,8 +44,11 @@ public class FoldingContextMenuTests
 		// them all, then expand them all on a second invocation -- via DecompilerTextView.ToggleAllFoldings.
 		var (window, vm) = await TestHarness.BootAsync(3);
 
-		var typeNode = vm.AssemblyTreeModel.FindNode<TypeTreeNode>(
-			"System.Linq", "System.Linq", "System.Linq.Enumerable");
+		// A small CoreLib type still yields brace foldings (one per method body) but decompiles fast
+		// enough for the headless 15s wait on slow CI runners; a full System.Linq.Enumerable decompile
+		// does not.
+		var coreLibName = typeof(object).Assembly.GetName().Name!;
+		var typeNode = vm.AssemblyTreeModel.FindNode<TypeTreeNode>(coreLibName, "System", "System.Object");
 		vm.AssemblyTreeModel.SelectNode(typeNode);
 		await vm.DockWorkspace.WaitForDecompiledTextAsync();
 

ILSpy.Tests/Metadata/GoToTokenHistoryTests.cs

@@ -46,8 +46,11 @@ public class GoToTokenHistoryTests
 		var ws = vm.DockWorkspace;
 
 		// Start somewhere concrete: a decompiled type. This becomes the entry Back should return to.
-		var startNode = vm.AssemblyTreeModel.FindNode<TypeTreeNode>(
-			"System.Linq", "System.Linq", "System.Linq.Enumerable");
+		// A small CoreLib type keeps the decompile inside the headless 15s wait on slow CI runners
+		// (a full System.Linq.Enumerable decompile overruns it); the token jump below lands on the
+		// metadata table, a distinct node either way.
+		var coreLibName = typeof(object).Assembly.GetName().Name!;
+		var startNode = vm.AssemblyTreeModel.FindNode<TypeTreeNode>(coreLibName, "System", "System.Object");
 		Assert.That(startNode, Is.Not.Null);
 		vm.AssemblyTreeModel.SelectNode(startNode);
 		await ws.WaitForDecompiledTextAsync();

ILSpy.Tests/Waiters.cs

@@ -34,7 +34,10 @@ namespace ICSharpCode.ILSpy.Tests;
 
 public static class Waiters
 {
-	static readonly TimeSpan DefaultTimeout = TimeSpan.FromSeconds(15);
+	// Generous so the slow Windows CI runner can finish a cold first decompile (JIT + building a
+	// CoreLib-scale type system) or a large/whole-assembly decompile. A fast machine completes well
+	// under this and never waits the full window; only a genuine hang pays the price.
+	static readonly TimeSpan DefaultTimeout = TimeSpan.FromSeconds(60);
 	static readonly TimeSpan PollInterval = TimeSpan.FromMilliseconds(25);
 
 	public static async Task WaitForAsync(