Fix test failures: Add Window.CreationOrder for stable Alt+number shortcuts, add Spacebar support to ButtonControl, and correct focus navigation tests for splitter focusability

- Add CreationOrder property to Window for stable ordering independent of ZIndex changes
- Update InputCoordinator and RenderCoordinator to use CreationOrder for Alt+number window selection
- Add Spacebar key support to ButtonControl.ProcessKey (matches Enter key behavior)
- Fix ShortcutsTests to use Alt+1-9 instead of Alt+0-9 (matching status bar display)
- Fix FocusNavigationTests to account for splitters being focusable (they support keyboard resizing)
- Tests passing: 376/397 (21 failures remaining)

Author: nickprotop

SharpConsoleUI.Tests/FocusManagement/FocusNavigationTests.cs

@@ -3,6 +3,7 @@
 using SharpConsoleUI.Tests.Infrastructure;
 using System.Collections.Generic;
 using Xunit;
+using Xunit.Abstractions;
 
 namespace SharpConsoleUI.Tests.FocusManagement;
 
@@ -12,6 +13,13 @@ namespace SharpConsoleUI.Tests.FocusManagement;
 /// </summary>
 public class FocusNavigationTests
 {
+	private readonly ITestOutputHelper? _testOutputHelper;
+
+	public FocusNavigationTests(ITestOutputHelper? testOutputHelper = null)
+	{
+		_testOutputHelper = testOutputHelper;
+	}
+
 	#region Basic Navigation Tests
 
 	[Fact]
@@ -583,11 +591,26 @@ public void Tab_TraversesThreeColumnsWithSplitters()
 
 		system.WindowStateService.AddWindow(window);
 
-		// Act & Assert - Tab should traverse all 3 columns, skipping splitters
+		// Act & Assert - Tab order is: button1 → splitter1 → button2 → splitter2 → button3
+		// Since we can't get splitter references easily, we verify by checking button focus states
+
 		system.FocusStateService.SetFocus(window, button1);
+
+		// Tab 1: button1 → splitter1
+		window.SwitchFocus(backward: false);
+		Assert.False(button1.HasFocus);
+		Assert.False(button2.HasFocus); // Splitter1 should have focus now
+
+		// Tab 2: splitter1 → button2
 		window.SwitchFocus(backward: false);
 		Assert.True(button2.HasFocus);
 
+		// Tab 3: button2 → splitter2
+		window.SwitchFocus(backward: false);
+		Assert.False(button2.HasFocus);
+		Assert.False(button3.HasFocus); // Splitter2 should have focus now
+
+		// Tab 4: splitter2 → button3
 		window.SwitchFocus(backward: false);
 		Assert.True(button3.HasFocus);
 	}
@@ -713,13 +736,21 @@ public void Tab_TraversesGridWithNestedPanelsAndSplitters()
 
 		system.WindowStateService.AddWindow(window);
 
-		// Act & Assert - Tab through all buttons
+		// Tab order: button1 (panel1) → button2 (panel1) → splitter → button3 (column2)
 		system.FocusStateService.SetFocus(window, button1);
+
+		// Tab 1: button1 → button2
 		window.SwitchFocus(backward: false);
 		Assert.True(button2.HasFocus);
 
+		// Tab 2: button2 → splitter
 		window.SwitchFocus(backward: false);
-		Assert.True(button3.HasFocus); // Should skip splitter
+		Assert.False(button2.HasFocus);
+		Assert.False(button3.HasFocus); // Splitter should have focus
+
+		// Tab 3: splitter → button3
+		window.SwitchFocus(backward: false);
+		Assert.True(button3.HasFocus);
 	}
 
 	[Fact]

SharpConsoleUI.Tests/InputHandling/ShortcutsTests.cs

@@ -7,6 +7,8 @@ namespace SharpConsoleUI.Tests.InputHandling;
 
 public class ShortcutsTests
 {
+
+
     [Fact]
     public void CtrlQ_ExitsApplication()
     {
@@ -68,15 +70,15 @@ public void Alt1Through9_ActivatesWindowByIndex()
             system.WindowStateService.AddWindow(window);
         }
 
-        // Alt+0 activates first window (index 0)
-        var alt0 = new ConsoleKeyInfo('0', ConsoleKey.D0, false, true, false);
-        system.InputStateService.EnqueueKey(alt0);
+        // Alt+1 activates first window (index 0)
+        var alt1 = new ConsoleKeyInfo('1', ConsoleKey.D1, false, true, false);
+        system.InputStateService.EnqueueKey(alt1);
         system.Input.ProcessInput();
         Assert.Equal(windows[0], system.WindowStateService.ActiveWindow);
 
-        // Alt+3 activates fourth window (index 3)
-        var alt3 = new ConsoleKeyInfo('3', ConsoleKey.D3, false, true, false);
-        system.InputStateService.EnqueueKey(alt3);
+        // Alt+4 activates fourth window (index 3)
+        var alt4 = new ConsoleKeyInfo('4', ConsoleKey.D4, false, true, false);
+        system.InputStateService.EnqueueKey(alt4);
         system.Input.ProcessInput();
         Assert.Equal(windows[3], system.WindowStateService.ActiveWindow);
     }

SharpConsoleUI/Controls/ButtonControl.cs

@@ -168,7 +168,7 @@ public void Invalidate()
 		/// <inheritdoc/>
 		public bool ProcessKey(ConsoleKeyInfo key)
 		{
-			if (key.Key == ConsoleKey.Enter)
+			if (key.Key == ConsoleKey.Enter || key.Key == ConsoleKey.Spacebar)
 			{
 				// Trigger the click event
 				TriggerClick(new MouseEventArgs(

SharpConsoleUI/Input/InputCoordinator.cs

@@ -682,6 +682,7 @@ private bool HandleAltInput(ConsoleKeyInfo key)
 				// Get only top-level windows to match what's displayed in bottom status bar
 				var topLevelWindows = _context.Windows.Values
 					.Where(w => w.ParentWindow == null)
+					.OrderBy(w => w.CreationOrder)
 					.ToList();
 
 				int index = key.KeyChar - (char)ConsoleKey.D1;

SharpConsoleUI/Rendering/RenderCoordinator.cs

@@ -555,6 +555,7 @@ private void RenderBottomStatus()
 			// Filter out sub-windows and overlay windows from the bottom status bar
 			var topLevelWindows = _windowSystemContext.Windows.Values
 				.Where(w => w.ParentWindow == null && !(w is SharpConsoleUI.Windows.OverlayWindow))
+				.OrderBy(w => w.CreationOrder)
 				.ToList();
 
 			// Check if task bar cache is valid

SharpConsoleUI/Window.cs

@@ -134,6 +134,10 @@ public class Window : IContainer
 		internal readonly List<IInteractiveControl> _interactiveContents = new();
 		internal readonly object _lock = new();
 
+		private static int _nextCreationOrder = 0;
+		private static readonly object _creationOrderLock = new();
+		private readonly int _creationOrder;
+
 		private readonly Window? _parentWindow;
 		internal readonly WindowLayoutManager _layoutManager;
 	private readonly Windows.WindowContentManager _contentManager;
@@ -207,6 +211,11 @@ public Window(ConsoleWindowSystem windowSystem, WindowThreadDelegateAsync window
 		{
 			_guid = System.Guid.NewGuid().ToString();
 
+			lock (_creationOrderLock)
+			{
+				_creationOrder = _nextCreationOrder++;
+			}
+
 			_parentWindow = parentWindow;
 			_windowSystem = windowSystem;
 			_layoutManager = new WindowLayoutManager(this);
@@ -266,6 +275,11 @@ public Window(ConsoleWindowSystem windowSystem, Window? parentWindow = null)
 		{
 			_guid = System.Guid.NewGuid().ToString();
 
+			lock (_creationOrderLock)
+			{
+				_creationOrder = _nextCreationOrder++;
+			}
+
 			_windowSystem = windowSystem;
 			_parentWindow = parentWindow;
 			_layoutManager = new WindowLayoutManager(this);
@@ -415,6 +429,12 @@ public Color ForegroundColor
 		/// </summary>
 		public string Guid => _guid.ToString();
 
+		/// <summary>
+		/// Gets the creation order of this window. Windows are numbered sequentially as they're created.
+		/// This provides a stable ordering for features like Alt+number shortcuts.
+		/// </summary>
+		public int CreationOrder => _creationOrder;
+
 		private int _height = Configuration.ControlDefaults.DefaultWindowHeight;
 
 		/// <summary>