From 8f7fc8129b526a10269525a1da6e2241e8e3d5df Mon Sep 17 00:00:00 2001
From: BDisp <bd.bdisp@gmail.com>
Date: Wed, 15 Mar 2023 19:14:26 +0000
Subject: [PATCH] Fixes #2416. Single smaller top level leaves chunk trails on
 move.

---
 Terminal.Gui/Core/Application.cs | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/Terminal.Gui/Core/Application.cs b/Terminal.Gui/Core/Application.cs
index a646cbddb..e70570d9f 100644
--- a/Terminal.Gui/Core/Application.cs
+++ b/Terminal.Gui/Core/Application.cs
@@ -1241,6 +1241,14 @@ namespace Terminal.Gui {
 				}
 				state.Toplevel.SetNeedsDisplay (state.Toplevel.Bounds);
 			}
+			if (toplevels.Count == 1 && state.Toplevel == Top
+				&& (Driver.Cols != state.Toplevel.Frame.Width || Driver.Rows != state.Toplevel.Frame.Height)
+				&& (!state.Toplevel.NeedDisplay.IsEmpty || state.Toplevel.ChildNeedsDisplay || state.Toplevel.LayoutNeeded)) {
+
+				Driver.SetAttribute (Colors.TopLevel.Normal);
+				state.Toplevel.Clear (new Rect (0, 0, Driver.Cols, Driver.Rows));
+
+			}
 			if (!state.Toplevel.NeedDisplay.IsEmpty || state.Toplevel.ChildNeedsDisplay || state.Toplevel.LayoutNeeded
 				|| MdiChildNeedsDisplay ()) {
 				state.Toplevel.Redraw (state.Toplevel.Bounds);