code: def update_fixed_order(self):
          "after pruning fixed order needs update to match new nnodes/ntips."
          # set tips order if fixing for multi-tree plotting (default None)
          fixed_order = self.ttree._fixed_order
          self.ttree_fixed_order = None
          self.ttree_fixed_idx = list(range(self.ttree.ntips))
  
          # check if fixed_order changed:
          if fixed_order:
              fixed_order = [
                  i for i in fixed_order if i in self.ttree.get_tip_labels()]
              self.ttree._set_fixed_order(fixed_order)
          else:
              self.ttree._fixed_idx = list(range(self.ttree.ntips)f update_fixed_order(self):
          "after pruning fixed order needs update to match new nnodes/ntips."
          # set tips order if fixing for multi-tree plotting (default None)
          fixed_order = self.ttree._fixed_order
          self.ttree_fixed_order = None
          self.ttree_fixed_idx = list(range(self.ttree.ntips))
  
          # check if fixed_order changed:
          if fixed_order:
              fixed_order = [
                  i for i in fixed_order if i in self.ttree.get_tip_labels()]
              self.ttree._set_fixed_order(fixed_order)
          else:
              self.ttree._fixed_idx = list(range(self.ttree.ntips))
docs: after pruning fixed order needs update to match new nnodes/ntips.