fixes 0003621: Additive and subtractive loft preview not showing during creation
fixes 0003621: Additive and subtractive loft preview not showing during creation

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