472     if any(len(char) > 1 for char in edgemap.values()):

   473         # limit drawing an edge to the first or last N lines of the current

   474         # section the rest of the edge is drawn like a parent line.

   475         parent = state['styles'][PARENT][-1:]

   476         def _drawgp(char, i):

   477             # should a grandparent character be drawn for this line?

   478             if len(char) < 2:

   479                 return True

   480             num = int(char[:-1])

   481             # either skip first num lines or take last num lines, based on sign

   482             return -num <= i if num < 0 else (len(lines) - i) <= num

   483         for i, line in enumerate(lines):

   484             line[:] = [c[-1:] if _drawgp(c, i) else parent for c in line]

   485         edgemap.update(

   486             (e, (c if len(c) < 2 else parent)) for e, c in edgemap.items())

   487