Renamed ConsoleDriver.Viewport, Screen

Terminal.Gui/ConsoleDrivers/ConsoleDriver.cs

@@ -18,6 +18,7 @@ public abstract class ConsoleDriver
     // This is in addition to the dirty flag on each cell.
     internal bool [] _dirtyLines;
 
+    // QUESTION: When non-full screen apps are supported, will this represent the app size, or will that be in Application?
     /// <summary>Gets the location and size of the terminal screen.</summary>
     public Rectangle Screen => new (0, 0, Cols, Rows);