+ Allow to get clean copy of a shape from Python

src/Mod/Part/App/TopoShapePy.xml

@@ -361,6 +361,15 @@ into BSpline surfaces.</UserDocu>
         <UserDocu>Create a copy of this shape</UserDocu>
       </Documentation>
     </Methode>
+    <Methode Name="cleaned" Const="true">
+      <Documentation>
+        <UserDocu>This creates a cleaned copy of the shape with the triangulation removed.
+This can be useful to reduce file size when exporting as a BRep file.
+Warning: Use the cleaned shape with care because certain algorithms may work incorrectly
+if the shape has no internal triangulation any more.
+</UserDocu>
+      </Documentation>
+    </Methode>
     <Methode Name="replaceShape" Const="true">
       <Documentation>
         <UserDocu>Replace a sub-shape with a new shape and return a new shape.

src/Mod/Part/App/TopoShapePyImp.cpp

@@ -172,6 +172,31 @@ PyObject* TopoShapePy::copy(PyObject *args)
     return cpy;
 }
 
+PyObject* TopoShapePy::cleaned(PyObject *args)
+{
+    if (!PyArg_ParseTuple(args, ""))
+        return NULL;
+
+    const TopoDS_Shape& shape = this->getTopoShapePtr()->_Shape;
+    PyTypeObject* type = this->GetType();
+    PyObject* cpy = 0;
+    // let the type object decide
+    if (type->tp_new)
+        cpy = type->tp_new(type, this, 0);
+    if (!cpy) {
+        PyErr_SetString(PyExc_TypeError, "failed to create copy of shape");
+        return 0;
+    }
+
+    if (!shape.IsNull()) {
+        BRepBuilderAPI_Copy c(shape);
+        const TopoDS_Shape& copiedShape = c.Shape();
+        BRepTools::Clean(copiedShape); // remove triangulation
+        static_cast<TopoShapePy*>(cpy)->getTopoShapePtr()->_Shape = c.Shape();
+    }
+    return cpy;
+}
+
 PyObject* TopoShapePy::replaceShape(PyObject *args)
 {
     PyObject *l;