From 186bd335856188c2b2b6ea5fec41f96856691eef Mon Sep 17 00:00:00 2001
From: balazs-bamer <kolaloka@freemail.hu>
Date: Sat, 27 Dec 2014 20:10:34 +0100
Subject: [PATCH] WMayer's fix: subshape copy

The subshape is copied to prevent the wire tool from modifying it. This
lets the user modify any supporting Bezier curves and the Bezier surface
will follow them.
---
 src/Mod/Surface/App/FeatureBezSurf.cpp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/Mod/Surface/App/FeatureBezSurf.cpp b/src/Mod/Surface/App/FeatureBezSurf.cpp
index e732cd62ff..8ea4d9a5fb 100644
--- a/src/Mod/Surface/App/FeatureBezSurf.cpp
+++ b/src/Mod/Surface/App/FeatureBezSurf.cpp
@@ -23,6 +23,7 @@
 
 #include "PreCompiled.h"
 #ifndef _PreComp_
+#include <BRepBuilderAPI_Copy.hxx>
 #include <BRepBuilderAPI_MakeFace.hxx>
 #include <TopoDS.hxx>
 #include <TopoDS_Face.hxx>
@@ -173,6 +174,9 @@ void getCurves(GeomFill_BezierCurves& aBuilder,TopoDS_Wire& aWire, const App::Pr
                
             //we want only the subshape which is linked
             sub = ts.getSubShape(set.sub);
+            // make a copy of the shape and the underlying geometry to avoid to affect the input shapes
+            BRepBuilderAPI_Copy copy(sub);
+            sub = copy.Shape();
             
             if(sub.ShapeType() == TopAbs_EDGE) {  //Check Shape type and assign edge
                 etmp = TopoDS::Edge(sub);