From d9fe689036b43c44b72043ab52982474fc6193d2 Mon Sep 17 00:00:00 2001
From: nyamatongwe <nyamatongwe@gmail.com>
Date: Wed, 17 Apr 2013 13:56:08 +1000
Subject: Disallow undo and redo when not collecting undo as it is likely that
 the document is not in the state at the end of the undo history and
 performing undo will not be able to return to a previous state.

---
 src/Document.cxx | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

(limited to 'src')

diff --git a/src/Document.cxx b/src/Document.cxx
index 56785af78..7eef844ee 100644
--- a/src/Document.cxx
+++ b/src/Document.cxx
@@ -892,7 +892,7 @@ void * SCI_METHOD Document::ConvertToDocument() {
 int Document::Undo() {
 	int newPos = -1;
 	CheckReadOnly();
-	if (enteredModification == 0) {
+	if ((enteredModification == 0) && (cb.IsCollectingUndo())) {
 		enteredModification++;
 		if (!cb.IsReadOnly()) {
 			bool startSavePoint = cb.IsSavePoint();
@@ -977,7 +977,7 @@ int Document::Undo() {
 int Document::Redo() {
 	int newPos = -1;
 	CheckReadOnly();
-	if (enteredModification == 0) {
+	if ((enteredModification == 0) && (cb.IsCollectingUndo())) {
 		enteredModification++;
 		if (!cb.IsReadOnly()) {
 			bool startSavePoint = cb.IsSavePoint();
-- 
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