* spot/twaalgos/zlktree.cc, spot/twaalgos/zlktree.hh: Here. * tests/python/zlktree.ipynb, tests/python/zlktree.py: Add tests and examples.
Reported by Florian. * spot/twaalgos/zlktree.cc: Handle the case where the condition does not cover all colors. * tests/python/zlktree.py: New file. * tests/Makefile.am: Add it.