From dc17dbf51077ba53915dd7ea8b25b88e2b63b022 Mon Sep 17 00:00:00 2001
From: Sergo <usakhelo@users.noreply.github.com>
Date: Wed, 8 Jun 2016 22:53:24 -0400
Subject: [PATCH] filter selection to exclude object duplicates before export

---
 src/Gui/Application.cpp | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/src/Gui/Application.cpp b/src/Gui/Application.cpp
index 52f83e0853c2..02da32008c4f 100644
--- a/src/Gui/Application.cpp
+++ b/src/Gui/Application.cpp
@@ -606,10 +606,12 @@ void Application::exportTo(const char* FileName, const char* DocName, const char
             }
 
             std::stringstream str;
+			std::set<App::DocumentObject*> unique_objs;
             str << "__objs__=[]" << std::endl;
             for (std::vector<App::DocumentObject*>::iterator it = sel.begin(); it != sel.end(); ++it) {
-                str << "__objs__.append(FreeCAD.getDocument(\"" << DocName << "\").getObject(\""
-                    << (*it)->getNameInDocument() << "\"))" << std::endl;
+				if (unique_objs.insert(*it).second)
+					str << "__objs__.append(FreeCAD.getDocument(\"" << DocName << "\").getObject(\""
+						<< (*it)->getNameInDocument() << "\"))" << std::endl;
             }
 
             str << "import " << Module << std::endl;