Fixes #4053. v2 WindowsDriver and v2win doesn't show any scenario in the UICatalog with cmd or conhost

Terminal.Gui/ConsoleDrivers/V2/ConsoleDriverFacade.cs

@@ -141,7 +141,11 @@ public int Top
     ///         <see langword="false"/>, indicating that the <see cref="ConsoleDriver"/> cannot support TrueColor.
     ///     </para>
     /// </remarks>
-    public bool Force16Colors { get; set; }
+    public bool Force16Colors
+    {
+        get => Application.Force16Colors || !SupportsTrueColor;
+        set => Application.Force16Colors = value || !SupportsTrueColor;
+    }
 
     /// <summary>
     ///     The <see cref="Attribute"/> that will be used for the next <see cref="AddRune(Rune)"/> or <see cref="AddStr"/>

Terminal.Gui/ConsoleDrivers/V2/MainLoopCoordinator.cs

@@ -25,6 +25,7 @@ internal class MainLoopCoordinator<T> : IMainLoopCoordinator
     private ConsoleDriverFacade<T> _facade;
     private Task _inputTask;
     private readonly ITimedEvents _timedEvents;
+    private readonly bool _isWindowsTerminal;
 
     private readonly SemaphoreSlim _startupSemaphore = new (0, 1);
 
@@ -60,6 +61,7 @@ IMainLoop<T> loop
         _inputProcessor = inputProcessor;
         _outputFactory = outputFactory;
         _loop = loop;
+        _isWindowsTerminal = Environment.GetEnvironmentVariable ("WT_SESSION") is { } || Environment.GetEnvironmentVariable ("VSAPPIDNAME") != null;
     }
 
     /// <summary>
@@ -159,6 +161,12 @@ private void BuildFacadeIfPossible ()
                            _output,
                            _loop.AnsiRequestScheduler,
                            _loop.WindowSizeMonitor);
+
+            if (!_isWindowsTerminal)
+            {
+                Application.Force16Colors = _facade.Force16Colors = true;
+            }
+
             Application.Driver = _facade;
 
             _startupSemaphore.Release ();

Terminal.Gui/ConsoleDrivers/V2/WindowsOutput.cs

@@ -56,6 +56,9 @@ private enum DesiredAccess : uint
     [DllImport ("kernel32.dll")]
     private static extern bool SetConsoleCursorPosition (nint hConsoleOutput, Coord dwCursorPosition);
 
+    [DllImport ("kernel32.dll", SetLastError = true)]
+    private static extern bool SetConsoleCursorInfo (nint hConsoleOutput, [In] ref ConsoleCursorInfo lpConsoleCursorInfo);
+
     private readonly nint _screenBuffer;
 
     public WindowsOutput ()
@@ -170,7 +173,7 @@ public void Write (IOutputBuffer buffer)
                              outputBuffer,
                              bufferCoords,
                              damageRegion,
-                             false))
+                             Application.Driver!.Force16Colors))
         {
             int err = Marshal.GetLastWin32Error ();
 
@@ -304,10 +307,23 @@ public Size GetWindowSize ()
     /// <inheritdoc/>
     public void SetCursorVisibility (CursorVisibility visibility)
     {
-        string cursorVisibilitySequence = visibility != CursorVisibility.Invisible
-            ? EscSeqUtils.CSI_ShowCursor
-            : EscSeqUtils.CSI_HideCursor;
-        Write (cursorVisibilitySequence);
+        if (Application.Driver!.Force16Colors)
+        {
+            var info = new ConsoleCursorInfo
+            {
+                dwSize = (uint)visibility & 0x00FF,
+                bVisible = ((uint)visibility & 0xFF00) != 0
+            };
+
+            SetConsoleCursorInfo (_screenBuffer, ref info);
+        }
+        else
+        {
+            string cursorVisibilitySequence = visibility != CursorVisibility.Invisible
+                                                  ? EscSeqUtils.CSI_ShowCursor
+                                                  : EscSeqUtils.CSI_HideCursor;
+            Write (cursorVisibilitySequence);
+        }
     }
 
     private Point _lastCursorPosition;