code: def clone_placeholder(self, placeholder):
          
          sp = placeholder.element
          ph_type, orient, sz, idx = (
              sp.ph_type, sp.ph_orient, sp.ph_sz, sp.ph_idx
          )
          id_ = self._next_shape_id
          name = self._next_ph_name(ph_type, id_, orient)
          self._spTree.add_placeholder(id_, name, ph_type, orient, sz, idx)
docs: Add a new placeholder shape based on *placeholder*.