Fix 'shrink curve' misbehaviors for Sketcher Extend
Fix 'shrink curve' misbehaviors for Sketcher Extend

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