From 655d3387283f85c55d4b2ec7ce9ed3d792f905f0 Mon Sep 17 00:00:00 2001
From: Neil <nyamatongwe@gmail.com>
Date: Mon, 19 Sep 2022 12:35:02 +1000
Subject: Stop turning on change history when there are steps that can be
 undone as performing undo before start of change history can crash.

---
 src/CellBuffer.cxx | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'src')

diff --git a/src/CellBuffer.cxx b/src/CellBuffer.cxx
index be018bbd6..14b2e3212 100644
--- a/src/CellBuffer.cxx
+++ b/src/CellBuffer.cxx
@@ -1397,7 +1397,7 @@ void CellBuffer::PerformRedoStep() {
 
 void CellBuffer::ChangeHistorySet(bool set) {
 	if (set) {
-		if (!changeHistory) {
+		if (!changeHistory && !uh.CanUndo()) {
 			changeHistory = std::make_unique<ChangeHistory>(Length());
 		}
 	} else {
-- 
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