From a7593f636f660158e86be65dfae61fb606f3de42 Mon Sep 17 00:00:00 2001
From: mpv <mikhail.ponikarov@opencascade.com>
Date: Mon, 10 Nov 2014 17:43:30 +0300
Subject: [PATCH] Issue 152 : do not compact empty transactions becasue it
 causes problem in OCCT

---
 src/Model/Model_Document.cpp | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/src/Model/Model_Document.cpp b/src/Model/Model_Document.cpp
index 15983188d..7e2d215ee 100644
--- a/src/Model/Model_Document.cpp
+++ b/src/Model/Model_Document.cpp
@@ -253,7 +253,13 @@ bool Model_Document::compactNested()
   }
   myIsEmptyTr[myTransactionsAfterSave] = allWasEmpty;
   myTransactionsAfterSave++;
-  myDoc->PerformDeltaCompaction();
+  if (allWasEmpty) {
+    // if everything is empty, it is a problem for OCCT to work with it, 
+    // just commit the empty that returns nothing
+    myDoc->CommitCommand();
+  } else {
+    myDoc->PerformDeltaCompaction();
+  }
   return !allWasEmpty;
 }
 
-- 
2.39.2