Fixes #3692++ - Rearchitects drivers

Terminal.Gui/ConsoleDrivers/V2/MainLoop.cs

@@ -113,6 +113,8 @@
     {
         InputProcessor.ProcessQueue ();
 
+        HackLayoutDrawIfTopChanged ();
+
         if (Application.Top != null)
         {
             bool needsDrawOrLayout = AnySubviewsNeedDrawn (Application.Top);
@@ -142,9 +144,24 @@
         Logging.IterationInvokesAndTimeouts.Record (swCallbacks.Elapsed.Milliseconds);
     }
 
+    private View? _lastTop;
+    private void HackLayoutDrawIfTopChanged ()
+    {
+        // TODO: This fixes closing a modal not making its host (below) refresh
+        //       until you click.  This should not be the job of the main loop!
+        var newTop = Application.Top;
+        if (_lastTop != null && _lastTop != newTop && newTop != null)
+        {
+            newTop.SetNeedsDraw();
+            newTop.SetNeedsLayout ();
+        }
+
+        _lastTop = Application.Top;
+    }
+
     private void SetCursor ()
     {
         View? mostFocused = Application.Top.MostFocused;
 
         if (mostFocused == null)
         {