From 697ce60c7dcef8dfa9a94fcf2163845fca36b296 Mon Sep 17 00:00:00 2001
From: Neil Hodgson <nyamatongwe@gmail.com>
Date: Thu, 21 May 2015 10:21:13 +1000
Subject: Fix bug with TentativeUndo where the undo history was being damaged
 on OS X. For example the sequence ['a', 'c', left, 'b', undo] would produce
 "c" instead of "ac".

---
 src/Document.cxx | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/Document.cxx b/src/Document.cxx
index 7d34dace1..3f365fdf4 100644
--- a/src/Document.cxx
+++ b/src/Document.cxx
@@ -216,6 +216,8 @@ void Document::SetSavePoint() {
 }
 
 void Document::TentativeUndo() {
+	if (!TentativeActive())
+		return;
 	CheckReadOnly();
 	if (enteredModification == 0) {
 		enteredModification++;
-- 
cgit v1.2.3