improve undo/redo handling

src/Mod/Surface/App/FeatureSurface.cpp

@@ -148,11 +148,11 @@ void ShapeValidator::checkAndAdd(const Part::TopoShape &ts, const char *subName,
 }
 
 
-PROPERTY_SOURCE(Surface::SurfaceFeature, Part::Feature)
+PROPERTY_SOURCE(Surface::SurfaceFeature, Part::Spline)
 
 const char* SurfaceFeature::FillTypeEnums[]    = {"Stretched", "Coons", "Curved", NULL};
 
-SurfaceFeature::SurfaceFeature(): Feature()
+SurfaceFeature::SurfaceFeature(): Spline()
 {
     ADD_PROPERTY(FillType, ((long)0));
     ADD_PROPERTY(BoundaryList, (0, "Dummy"));

src/Mod/Surface/App/FeatureSurface.h

@@ -31,7 +31,7 @@
 #include <App/PropertyStandard.h>
 #include <App/PropertyUnits.h>
 #include <App/PropertyLinks.h>
-#include <Mod/Part/App/PartFeature.h>
+#include <Mod/Part/App/FeaturePartSpline.h>
 
 namespace Surface
 {
@@ -61,7 +61,7 @@ public:
     }
 };
   
-class SurfaceFeature : public Part::Feature
+class SurfaceFeature : public Part::Spline
 {
   PROPERTY_HEADER(Surface::SurfaceFeature);