django-mptt/django-mptt — pull request #323 by mattjmorrison (2014-08-26 21:16:38+00:00)
Title: Issue with ancestors when moving nodes

I ran into an issue with moving nodes where the ancestors are no longer
correct. This is just a description of the error along with a failing test. I have no solution, I would be extremely grateful if someone did have a solution that they could offer.

Consider the tree (where 1 and 0 are siblings)

1 0
\
2
\
3
\
4

if I move 1 to be a direct child of 0 (giving this tree)

0
\
1
\
2
\
3
\
4

then move 3 to be a child of 1 giving this tree

0
\
1
/ \
3 2
/
4

I would expect the ancestors of 4 to now be 0, 1, 3, instead as you can
see in the failing test it is being reported as 0, 1, 2