From 9bf4e367e749bb9c09b8aa8813b7faf2fc1ea078 Mon Sep 17 00:00:00 2001
From: John Lewin <lewin76@gmail.com>
Date: Tue, 21 Aug 2018 12:29:09 -0700
Subject: [PATCH] Consider UndoBuffer state on load

- Issue MatterHackers/MCCentral#4023
Undo history is lost on ReloadAll
---
 PartPreviewWindow/ViewControls3D.cs | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/PartPreviewWindow/ViewControls3D.cs b/PartPreviewWindow/ViewControls3D.cs
index 609e152c1..a126703b1 100644
--- a/PartPreviewWindow/ViewControls3D.cs
+++ b/PartPreviewWindow/ViewControls3D.cs
@@ -210,6 +210,9 @@ namespace MatterHackers.MatterControl.PartPreviewWindow
 				redoButton.Enabled = undoBuffer.RedoCount > 0;
 			};
 
+			undoButton.Enabled = undoBuffer.UndoCount > 0;
+			redoButton.Enabled = undoBuffer.RedoCount > 0;
+
 			var buttonGroupA = new ObservableCollection<GuiWidget>();
 
 			if (UserSettings.Instance.IsTouchScreen)