After consulting Edward and Terry, the finished (I think)
'unmark-first-parents' command now works as intended.
@language python
def unmark_first_parents():
"""unmark the first parent of each node, moving up the tree
to the top level. print the list of unmarked parents."""
parent_lst = []
old_p = p = c.p
if p.isMarked():
c.clearMarked(p)
for nd in p.self_and_siblings():
if nd.v != old_p.v:
if nd.v.isMarked():
break
else:
for parent in p.parents():
if parent.isMarked():
c.clearMarked(parent)
parent_lst.append(parent.h)
c.redraw()
if parent_lst:
g.es("unmarked: " + str(parent_lst))
unmark_first_parents()
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