From 2c18493b0341b6e255cd2381ef717e916ddc387a Mon Sep 17 00:00:00 2001
From: mpv <mikhail.ponikarov@opencascade.com>
Date: Mon, 8 Dec 2014 10:16:17 +0300
Subject: [PATCH] Issue #302: correctly abort sketch transaction

---
 src/Model/Model_Document.cpp | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/src/Model/Model_Document.cpp b/src/Model/Model_Document.cpp
index 6c817c4b3..62b157e04 100644
--- a/src/Model/Model_Document.cpp
+++ b/src/Model/Model_Document.cpp
@@ -338,8 +338,9 @@ void Model_Document::abortOperation()
 {
   if (myNestedNum > 0 && !myDoc->HasOpenCommand()) {  // abort all what was done in nested
       // first compact all nested
-    compactNested();
-    myDoc->Undo();
+    if (compactNested()) {
+      myDoc->Undo(); // undo only compacted, if not: do not undo the empty transaction
+    }
     myDoc->ClearRedos();
     myTransactionsAfterSave--;
     myIsEmptyTr.erase(myTransactionsAfterSave);
-- 
2.39.2