fixes 0003846: unexpected result in building RuledSurface
fixes 0003846: unexpected result in building RuledSurface

Fat-Zer/FreeCAD_sf_master,Fat-Zer/FreeCAD_sf_master,Fat-Zer/FreeCAD_sf_master,Fat-Zer/FreeCAD_sf_master,Fat-Zer/FreeCAD_sf_master