From 19d07892f469df55ae711c4f3bdf14eac8aaafb3 Mon Sep 17 00:00:00 2001
From: QwiglyDee <qwiglydee@gmail.com>
Date: Tue, 5 Jan 2021 21:33:38 +0700
Subject: [PATCH] fix #1240 undoing add_grid

---
 src/ifcblenderexport/blenderbim/bim/operator.py | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/ifcblenderexport/blenderbim/bim/operator.py b/src/ifcblenderexport/blenderbim/bim/operator.py
index cb41d7aaa3..136e650675 100644
--- a/src/ifcblenderexport/blenderbim/bim/operator.py
+++ b/src/ifcblenderexport/blenderbim/bim/operator.py
@@ -4145,6 +4145,7 @@ class SnapSpacesTogether(bpy.types.Operator):
 class CopyGrid(bpy.types.Operator):
     bl_idname = "bim.add_grid"
     bl_label = "Add Grid"
+    bl_options = {'UNDO'}
 
     def execute(self, context):
         props = context.scene.DocProperties