Refactor Force16Colors and ForceDriver according to requirements

- Created new public Driver class in Terminal.Gui.Drivers namespace to hold Force16Colors static property
- Removed Force16Colors from Application and IApplication
- Modified DriverImpl to read Force16Colors at construction time and store in instance field
- Added GetForce16Colors() method to IDriver interface
- Made ForceDriver get-only on IApplication (setter remains on Application static class)
- Updated all references to use Driver.Force16Colors instead of Application.Force16Colors
- Updated Output classes (FakeOutput, NetOutput, UnixOutput) to use Driver.Force16Colors
- Updated ApplicationImpl to reset Driver.Force16Colors instead of Application.Force16Colors
- Fixed tests to use Application.ForceDriver setter instead of IApplication.ForceDriver

Co-authored-by: tig <[email protected]>

Examples/UICatalog/Scenarios/ColorPicker.cs

@@ -186,11 +186,11 @@ public class ColorPickers : Scenario
         {
             X = Pos.Right (cbSupportsTrueColor) + 1,
             Y = Pos.Top (lblDriverName),
-            CheckedState = Application.Force16Colors ? CheckState.Checked : CheckState.UnChecked,
+            CheckedState = Terminal.Gui.Drivers.Driver.Force16Colors ? CheckState.Checked : CheckState.UnChecked,
             Enabled = canTrueColor,
             Text = "Force16Colors"
         };
-        cbUseTrueColor.CheckedStateChanging += (_, evt) => { Application.Force16Colors = evt.Result == CheckState.Checked; };
+        cbUseTrueColor.CheckedStateChanging += (_, evt) => { Terminal.Gui.Drivers.Driver.Force16Colors = evt.Result == CheckState.Checked; };
         app.Add (lblDriverName, cbSupportsTrueColor, cbUseTrueColor);
 
         // Set default colors.

Examples/UICatalog/Scenarios/Images.cs

@@ -122,11 +122,11 @@ public class Images : Scenario
         {
             X = Pos.Right (cbSupportsTrueColor) + 2,
             Y = 0,
-            CheckedState = !Application.Force16Colors ? CheckState.Checked : CheckState.UnChecked,
+            CheckedState = !Terminal.Gui.Drivers.Driver.Force16Colors ? CheckState.Checked : CheckState.UnChecked,
             Enabled = canTrueColor,
             Text = "Use true color"
         };
-        cbUseTrueColor.CheckedStateChanging += (_, evt) => Application.Force16Colors = evt.Result == CheckState.UnChecked;
+        cbUseTrueColor.CheckedStateChanging += (_, evt) => Terminal.Gui.Drivers.Driver.Force16Colors = evt.Result == CheckState.UnChecked;
         _win.Add (cbUseTrueColor);
 
         var btnOpenImage = new Button { X = Pos.Right (cbUseTrueColor) + 2, Y = 0, Text = "Open Image" };

Examples/UICatalog/Scenarios/LineDrawing.cs

@@ -133,14 +133,14 @@ public class LineDrawing : Scenario
         var d = new Dialog
         {
             Title = title,
-            Width = Application.Force16Colors ? 35 : Dim.Auto (DimAutoStyle.Auto, Dim.Percent (80), Dim.Percent (90)),
+            Width = Terminal.Gui.Drivers.Driver.Force16Colors ? 35 : Dim.Auto (DimAutoStyle.Auto, Dim.Percent (80), Dim.Percent (90)),
             Height = 10
         };
 
         var btnOk = new Button
         {
             X = Pos.Center () - 5,
-            Y = Application.Force16Colors ? 6 : 4,
+            Y = Terminal.Gui.Drivers.Driver.Force16Colors ? 6 : 4,
             Text = "Ok",
             Width = Dim.Auto (),
             IsDefault = true
@@ -174,7 +174,7 @@ public class LineDrawing : Scenario
         d.AddButton (btnCancel);
 
         View cp;
-        if (Application.Force16Colors)
+        if (Terminal.Gui.Drivers.Driver.Force16Colors)
         {
             cp = new ColorPicker16
             {
@@ -197,7 +197,7 @@ public class LineDrawing : Scenario
 
         Application.Run (d);
         d.Dispose ();
-        newColor = Application.Force16Colors ? ((ColorPicker16)cp).SelectedColor : ((ColorPicker)cp).SelectedColor;
+        newColor = Terminal.Gui.Drivers.Driver.Force16Colors ? ((ColorPicker16)cp).SelectedColor : ((ColorPicker)cp).SelectedColor;
 
         return accept;
     }

Examples/UICatalog/UICatalogRunnable.cs

@@ -176,7 +176,7 @@ public class UICatalogRunnable : Runnable
             _force16ColorsMenuItemCb = new ()
             {
                 Title = "Force _16 Colors",
-                CheckedState = Application.Force16Colors ? CheckState.Checked : CheckState.UnChecked,
+                CheckedState = Terminal.Gui.Drivers.Driver.Force16Colors ? CheckState.Checked : CheckState.UnChecked,
                 // Best practice for CheckBoxes in menus is to disable focus and highlight states
                 CanFocus = false,
                 HighlightStates = MouseState.None
@@ -184,7 +184,7 @@ public class UICatalogRunnable : Runnable
 
             _force16ColorsMenuItemCb.CheckedStateChanging += (sender, args) =>
                                                              {
-                                                                 if (Application.Force16Colors
+                                                                 if (Terminal.Gui.Drivers.Driver.Force16Colors
                                                                      && args.Result == CheckState.UnChecked
                                                                      && !Application.Driver!.SupportsTrueColor)
                                                                  {
@@ -194,7 +194,7 @@ public class UICatalogRunnable : Runnable
 
             _force16ColorsMenuItemCb.CheckedStateChanged += (sender, args) =>
                                                             {
-                                                                Application.Force16Colors = args.Value == CheckState.Checked;
+                                                                Terminal.Gui.Drivers.Driver.Force16Colors = args.Value == CheckState.Checked;
 
                                                                 _force16ColorsShortcutCb!.CheckedState = args.Value;
                                                                 Application.LayoutAndDraw ();
@@ -646,13 +646,13 @@ public class UICatalogRunnable : Runnable
         _force16ColorsShortcutCb = new ()
         {
             Title = "16 color mode",
-            CheckedState = Application.Force16Colors ? CheckState.Checked : CheckState.UnChecked,
+            CheckedState = Terminal.Gui.Drivers.Driver.Force16Colors ? CheckState.Checked : CheckState.UnChecked,
             CanFocus = false
         };
 
         _force16ColorsShortcutCb.CheckedStateChanging += (sender, args) =>
                                                          {
-                                                             if (Application.Force16Colors
+                                                             if (Terminal.Gui.Drivers.Driver.Force16Colors
                                                                  && args.Result == CheckState.UnChecked
                                                                  && !Application.Driver!.SupportsTrueColor)
                                                              {
@@ -663,7 +663,7 @@ public class UICatalogRunnable : Runnable
 
         _force16ColorsShortcutCb.CheckedStateChanged += (sender, args) =>
                                                          {
-                                                             Application.Force16Colors = args.Value == CheckState.Checked;
+                                                             Terminal.Gui.Drivers.Driver.Force16Colors = args.Value == CheckState.Checked;
                                                              _force16ColorsMenuItemCb!.CheckedState = args.Value;
                                                              Application.LayoutAndDraw ();
                                                          };
@@ -714,7 +714,7 @@ public class UICatalogRunnable : Runnable
         }
 
         _disableMouseCb!.CheckedState = Application.IsMouseDisabled ? CheckState.Checked : CheckState.UnChecked;
-        _force16ColorsShortcutCb!.CheckedState = Application.Force16Colors ? CheckState.Checked : CheckState.UnChecked;
+        _force16ColorsShortcutCb!.CheckedState = Terminal.Gui.Drivers.Driver.Force16Colors ? CheckState.Checked : CheckState.UnChecked;
 
         Application.TopRunnableView?.SetNeedsDraw ();
     }

Terminal.Gui/App/Application.Driver.cs

@@ -13,25 +13,6 @@ public static partial class Application // Driver abstractions
         internal set => ApplicationImpl.Instance.Driver = value;
     }
 
-    private static bool _force16Colors = false; // Resources/config.json overrides
-
-    /// <inheritdoc cref="IApplication.Force16Colors"/>
-    [ConfigurationProperty (Scope = typeof (SettingsScope))]
-    [Obsolete ("The legacy static Application object is going away.")]
-    public static bool Force16Colors
-    {
-        get => _force16Colors;
-        set
-        {
-            bool oldValue = _force16Colors;
-            _force16Colors = value;
-            Force16ColorsChanged?.Invoke (null, new ValueChangedEventArgs<bool> (oldValue, _force16Colors));
-        }
-    }
-
-    /// <summary>Raised when <see cref="Force16Colors"/> changes.</summary>
-    public static event EventHandler<ValueChangedEventArgs<bool>>? Force16ColorsChanged;
-
     private static string _forceDriver = string.Empty; // Resources/config.json overrides
 
     /// <inheritdoc cref="IApplication.ForceDriver"/>

Terminal.Gui/App/ApplicationImpl.Driver.cs

@@ -8,10 +8,7 @@ internal partial class ApplicationImpl
     public IDriver? Driver { get; set; }
 
     /// <inheritdoc/>
-    public bool Force16Colors { get; set; }
-
-    /// <inheritdoc/>
-    public string ForceDriver { get; set; } = string.Empty;
+    public string ForceDriver { get; internal set; } = string.Empty;
 
     /// <inheritdoc/>
     public List<SixelToRender> Sixel { get; } = new ();

Terminal.Gui/App/ApplicationImpl.Lifecycle.cs

@@ -313,7 +313,7 @@ internal partial class ApplicationImpl
         // Note: ForceDriver and Force16Colors are reset
         // If they need to persist across Init/Shutdown cycles
         // then the user of the library should manage that state
-        Force16Colors = false;
+        Terminal.Gui.Drivers.Driver.Force16Colors = false;
         ForceDriver = string.Empty;
 
         // === 11. Reset synchronization context ===
@@ -365,8 +365,6 @@ internal partial class ApplicationImpl
 #endif
 
     // Event handlers for Application static property changes
-    private void OnForce16ColorsChanged (object? sender, ValueChangedEventArgs<bool> e) { Force16Colors = e.NewValue; }
-
     private void OnForceDriverChanged (object? sender, ValueChangedEventArgs<string> e) { ForceDriver = e.NewValue; }
 
     /// <summary>
@@ -374,7 +372,6 @@ internal partial class ApplicationImpl
     /// </summary>
     private void UnsubscribeApplicationEvents ()
     {
-        Application.Force16ColorsChanged -= OnForce16ColorsChanged;
         Application.ForceDriverChanged -= OnForceDriverChanged;
     }
 }

Terminal.Gui/App/ApplicationImpl.cs

@@ -15,7 +15,6 @@ internal partial class ApplicationImpl : IApplication
     internal ApplicationImpl ()
     {
         // Subscribe to Application static property change events
-        Application.Force16ColorsChanged += OnForce16ColorsChanged;
         Application.ForceDriverChanged += OnForceDriverChanged;
     }
 
@@ -146,7 +145,7 @@ internal partial class ApplicationImpl : IApplication
         // Reset Application static properties to their defaults
         // This ensures tests start with clean state
         Application.ForceDriver = string.Empty;
-        Application.Force16Colors = false;
+        Drivers.Driver.Force16Colors = false;
         Application.IsMouseDisabled = false;
         Application.QuitKey = Key.Esc;
         Application.ArrangeKey = Key.F5.WithCtrl;

Terminal.Gui/App/IApplication.cs

@@ -450,17 +450,10 @@ public interface IApplication : IDisposable
     IClipboard? Clipboard { get; }
 
     /// <summary>
-    ///     Gets or sets whether <see cref="Driver"/> will be forced to output only the 16 colors defined in
-    ///     <see cref="ColorName16"/>. The default is <see langword="false"/>, meaning 24-bit (TrueColor) colors will be
-    ///     output as long as the selected <see cref="IDriver"/> supports TrueColor.
+    ///     Gets the name of the driver to force. One of "fake", "dotnet", "windows", or "unix".
+    ///     If not specified, the driver is selected based on the platform.
     /// </summary>
-    bool Force16Colors { get; set; }
-
-    /// <summary>
-    ///     Forces the use of the specified driver (one of "fake", "dotnet", "windows", or "unix"). If not
-    ///     specified, the driver is selected based on the platform.
-    /// </summary>
-    string ForceDriver { get; set; }
+    string ForceDriver { get; }
 
     /// <summary>
     ///     Gets or location and size of the application in the terminal. By default, the location is (0, 0) and the size

Terminal.Gui/Drivers/DotNetDriver/NetOutput.cs

@@ -81,7 +81,7 @@ public class NetOutput : OutputBase, IOutput
     /// <inheritdoc/>
     protected override void AppendOrWriteAttribute (StringBuilder output, Attribute attr, TextStyle redrawTextStyle)
     {
-        if (Application.Force16Colors)
+        if (Terminal.Gui.Drivers.Driver.Force16Colors)
         {
             output.Append (EscSeqUtils.CSI_SetForegroundColor (attr.Foreground.GetAnsiColorCode ()));
             output.Append (EscSeqUtils.CSI_SetBackgroundColor (attr.Background.GetAnsiColorCode ()));

Terminal.Gui/Drivers/Driver.cs

@@ -0,0 +1,29 @@
+namespace Terminal.Gui.Drivers;
+
+/// <summary>
+///     Provides driver-wide configuration settings.
+/// </summary>
+public static class Driver
+{
+    private static bool _force16Colors = false; // Resources/config.json overrides
+
+    /// <summary>
+    ///     Gets or sets whether drivers should use 16 colors instead of the default TrueColors.
+    ///     This is a process-wide setting that is read by each driver instance at construction time.
+    /// </summary>
+    /// <remarks>
+    ///     <para>
+    ///         This setting is read by driver instances when they are created. Changing this value after
+    ///         a driver has been initialized will not affect existing driver instances.
+    ///     </para>
+    ///     <para>
+    ///         Individual drivers may override this if they do not support TrueColor output.
+    ///     </para>
+    /// </remarks>
+    [ConfigurationProperty (Scope = typeof (SettingsScope), OmitClassName = false)]
+    public static bool Force16Colors
+    {
+        get => _force16Colors;
+        set => _force16Colors = value;
+    }
+}

Terminal.Gui/Drivers/DriverImpl.cs

@@ -31,6 +31,7 @@ internal class DriverImpl : IDriver
     private readonly IOutput _output;
     private readonly AnsiRequestScheduler _ansiRequestScheduler;
     private CursorVisibility _lastCursor = CursorVisibility.Default;
+    private readonly bool _instanceForce16Colors;
 
     /// <summary>
     ///     Initializes a new instance of the <see cref="DriverImpl"/> class.
@@ -53,6 +54,9 @@ internal class DriverImpl : IDriver
         OutputBuffer = outputBuffer;
         _ansiRequestScheduler = ansiRequestScheduler;
 
+        // Read the static Force16Colors value at construction time and store in instance field
+        _instanceForce16Colors = Terminal.Gui.Drivers.Driver.Force16Colors;
+
         InputProcessor.KeyDown += (s, e) => KeyDown?.Invoke (s, e);
         InputProcessor.KeyUp += (s, e) => KeyUp?.Invoke (s, e);
 
@@ -202,13 +206,15 @@ internal class DriverImpl : IDriver
     public bool SupportsTrueColor => true;
 
     /// <inheritdoc/>
-
-    public bool Force16Colors
+    bool IDriver.Force16Colors
     {
-        get => Application.Force16Colors || !SupportsTrueColor;
-        set => Application.Force16Colors = value || !SupportsTrueColor;
+        get => _instanceForce16Colors || !SupportsTrueColor;
+        set => throw new InvalidOperationException ("Force16Colors is read-only per driver instance. Set Terminal.Gui.Drivers.Driver.Force16Colors static property before driver creation.");
     }
 
+    /// <inheritdoc/>
+    public bool GetForce16Colors () => _instanceForce16Colors || !SupportsTrueColor;
+
     /// <inheritdoc/>
 
     public Attribute CurrentAttribute

Terminal.Gui/Drivers/FakeDriver/FakeOutput.cs

@@ -86,7 +86,7 @@ public class FakeOutput : OutputBase, IOutput
     /// <inheritdoc/>
     protected override void AppendOrWriteAttribute (StringBuilder output, Attribute attr, TextStyle redrawTextStyle)
     {
-        if (Application.Force16Colors)
+        if (Terminal.Gui.Drivers.Driver.Force16Colors)
         {
             output.Append (EscSeqUtils.CSI_SetForegroundColor (attr.Foreground.GetAnsiColorCode ()));
             output.Append (EscSeqUtils.CSI_SetBackgroundColor (attr.Background.GetAnsiColorCode ()));

Terminal.Gui/Drivers/IDriver.cs

@@ -84,8 +84,9 @@ public interface IDriver
     bool SupportsTrueColor { get; }
 
     /// <summary>
-    ///     Gets or sets whether the <see cref="IDriver"/> should use 16 colors instead of the default TrueColors.
-    ///     See <see cref="Application.Force16Colors"/> to change this setting via <see cref="ConfigurationManager"/>.
+    ///     Gets whether the <see cref="IDriver"/> should use 16 colors instead of the default TrueColors.
+    ///     This value is set at driver construction time from the static <c>Terminal.Gui.Drivers.Driver.Force16Colors</c> property.
+    ///     Use <see cref="GetForce16Colors"/> to retrieve this value.
     /// </summary>
     /// <remarks>
     ///     <para>
@@ -95,6 +96,14 @@ public interface IDriver
     /// </remarks>
     bool Force16Colors { get; set; }
 
+    /// <summary>
+    ///     Gets whether the <see cref="IDriver"/> is using 16 colors instead of TrueColors.
+    /// </summary>
+    /// <returns>
+    ///     <see langword="true"/> if the driver is using 16 colors; otherwise, <see langword="false"/>.
+    /// </returns>
+    bool GetForce16Colors ();
+
     /// <summary>
     ///     The <see cref="System.Attribute"/> that will be used for the next <see cref="AddRune(Rune)"/> or
     ///     <see cref="AddStr"/>

Terminal.Gui/Drivers/UnixDriver/UnixOutput.cs

@@ -39,7 +39,7 @@ internal class UnixOutput : OutputBase, IOutput
     /// <inheritdoc />
     protected override void AppendOrWriteAttribute (StringBuilder output, Attribute attr, TextStyle redrawTextStyle)
     {
-        if (Application.Force16Colors)
+        if (Terminal.Gui.Drivers.Driver.Force16Colors)
         {
             output.Append (EscSeqUtils.CSI_SetForegroundColor (attr.Foreground.GetAnsiColorCode ()));
             output.Append (EscSeqUtils.CSI_SetBackgroundColor (attr.Background.GetAnsiColorCode ()));

Terminal.Gui/Views/Color/ColorPicker.Prompt.cs

@@ -1,5 +1,7 @@
 #nullable disable
 
+using DriverConfig = Terminal.Gui.Drivers.Driver;
+
 namespace Terminal.Gui.Views;
 
 public partial class ColorPicker
@@ -21,14 +23,14 @@ public partial class ColorPicker
         var d = new Dialog
         {
             Title = title,
-            Width = Application.Force16Colors ? 37 : Dim.Auto (DimAutoStyle.Auto, Dim.Percent (80), Dim.Percent (90)),
+            Width = DriverConfig.Force16Colors ? 37 : Dim.Auto (DimAutoStyle.Auto, Dim.Percent (80), Dim.Percent (90)),
             Height = 20
         };
 
         var btnOk = new Button
         {
             X = Pos.Center () - 5,
-            Y = Application.Force16Colors ? 6 : 4,
+            Y = DriverConfig.Force16Colors ? 6 : 4,
             Text = "Ok",
             Width = Dim.Auto (),
             IsDefault = true
@@ -63,7 +65,7 @@ public partial class ColorPicker
 
         View cpForeground;
 
-        if (Application.Force16Colors)
+        if (DriverConfig.Force16Colors)
         {
             cpForeground = new ColorPicker16
             {
@@ -88,7 +90,7 @@ public partial class ColorPicker
 
         View cpBackground;
 
-        if (Application.Force16Colors)
+        if (DriverConfig.Force16Colors)
         {
             cpBackground = new ColorPicker16
             {
@@ -117,8 +119,8 @@ public partial class ColorPicker
 
         app.Run (d);
         d.Dispose ();
-        Color newForeColor = Application.Force16Colors ? ((ColorPicker16)cpForeground).SelectedColor : ((ColorPicker)cpForeground).SelectedColor;
-        Color newBackColor = Application.Force16Colors ? ((ColorPicker16)cpBackground).SelectedColor : ((ColorPicker)cpBackground).SelectedColor;
+        Color newForeColor = DriverConfig.Force16Colors ? ((ColorPicker16)cpForeground).SelectedColor : ((ColorPicker)cpForeground).SelectedColor;
+        Color newBackColor = DriverConfig.Force16Colors ? ((ColorPicker16)cpBackground).SelectedColor : ((ColorPicker)cpBackground).SelectedColor;
         newAttribute = new (newForeColor, newBackColor);
         app.Dispose ();
         return accept;

Terminal.Gui/Views/Shortcut.cs

@@ -391,7 +391,7 @@ public class Shortcut : View, IOrientation, IDesignable
     /// <example>
     ///     <para>
     ///         This example illustrates how to add a <see cref="Shortcut"/> to a <see cref="StatusBar"/> that toggles the
-    ///         <see cref="IApplication.Force16Colors"/> property.
+    ///         <see cref="IDriver.Force16Colors"/> property.
     ///     </para>
     ///     <code>
     ///     var force16ColorsShortcut = new Shortcut
@@ -401,12 +401,12 @@ public class Shortcut : View, IOrientation, IDesignable
     ///         CommandView = new CheckBox { Text = "Force 16 Colors" }
     ///     };
     ///     var cb = force16ColorsShortcut.CommandView as CheckBox;
-    ///     cb.Checked = Application.Force16Colors;
+    ///     cb.Checked = Terminal.Gui.Drivers.Driver.Force16Colors;
     /// 
     ///     cb.Toggled += (s, e) =>
     ///     {
     ///         var cb = s as CheckBox;
-    ///         Application.Force16Colors = cb!.Checked == true;
+    ///         Terminal.Gui.Drivers.Driver.Force16Colors = cb!.Checked == true;
     ///         Application.Refresh();
     ///     };
     ///     StatusBar.Add(force16ColorsShortcut);

Tests/UnitTestsParallelizable/Application/ApplicationTests.cs

@@ -132,7 +132,7 @@ public class ApplicationTests (ITestOutputHelper output)
     {
         using IApplication app = Application.Create ();
 
-        app.ForceDriver = "fake";
+        Application.ForceDriver = "fake";
         // Note: Init() without params picks up driver configuration
         app.Init ();
 

Tests/UnitTestsParallelizable/Drivers/ToAnsiTests.cs

@@ -73,7 +73,7 @@ public class ToAnsiTests : FakeDriverBase
     public void ToAnsi_With_Background_Colors (bool force16Colors, string expected)
     {
         IDriver driver = CreateFakeDriver (10, 2);
-        Application.Force16Colors = force16Colors;
+        Terminal.Gui.Drivers.Driver.Force16Colors = force16Colors;
 
         // Set background color
         driver.CurrentAttribute = new (Color.White, Color.Red);
@@ -210,7 +210,7 @@ public class ToAnsiTests : FakeDriverBase
         IDriver driver = CreateFakeDriver (10, 1);
 
         // Use RGB colors (when not forcing 16 colors)
-        Application.Force16Colors = false;
+        Terminal.Gui.Drivers.Driver.Force16Colors = false;
         try
         {
             driver.CurrentAttribute = new Attribute (new Color (255, 0, 0), new Color (0, 255, 0));
@@ -224,7 +224,7 @@ public class ToAnsiTests : FakeDriverBase
         }
         finally
         {
-            Application.Force16Colors = true; // Reset
+            Terminal.Gui.Drivers.Driver.Force16Colors = true; // Reset
         }
     }
 
@@ -234,7 +234,7 @@ public class ToAnsiTests : FakeDriverBase
         IDriver driver = CreateFakeDriver (10, 1);
 
         // Force 16 colors
-        Application.Force16Colors = true;
+        Terminal.Gui.Drivers.Driver.Force16Colors = true;
         driver.CurrentAttribute = new Attribute (Color.Red, Color.Blue);
         driver.AddStr ("16Color");
 

Tests/UnitTestsParallelizable/TestSetup.cs

@@ -44,8 +44,8 @@ public class GlobalTestSetup : IDisposable
 
         //// Don't check Application.ForceDriver
         //Assert.Empty (Application.ForceDriver);
-        //// Don't check Application.Force16Colors
-        ////Assert.False (Application.Force16Colors);
+        //// Don't check Terminal.Gui.Drivers.Driver.Force16Colors
+        ////Assert.False (Terminal.Gui.Drivers.Driver.Force16Colors);
         //Assert.Null (Application.Driver);
         //Assert.False (Application.StopAfterFirstIteration);
         Assert.Equal (Key.Tab.WithShift, Application.PrevTabKey);