Inconsistent handling of "depth=1" for "level=0" versus "level>0".

[d-maurer]

>>> from Products.ExtendedPathIndex.ExtendedPathIndex import ExtendedPathIndex
>>> 
>>> pi = ExtendedPathIndex("pi")
>>> paths = {}
>>> 
>>> for leaf in ("1/1 1/12/121 1/12/122 2/21/1".split()):
...   comps = leaf.split("/")
...   pd = paths
...   for c in comps:
...     if c not in pd: pd[c] = {}
...     pd = pd[c]
... 
>>> def gen(prefix, pd):
...   for c in sorted(pd):
...     np = prefix + "/" + c
...     yield np
...     yield from gen(np, pd[c])
... 
>>> class _O(object):
...   def __init__(self, pi): self.pi = pi
... 
>>> for i, p in enumerate(gen("", paths)):
...   print(i, p)
...   indexed = pi.index_object(i, _O(p))
... 
0 /1
1 /1/1
2 /1/12
3 /1/12/121
4 /1/12/122
5 /2
6 /2/21
7 /2/21/1
>>> list(pi.search("1/12", default_level=0, depth=1))
[3, 4]
>>> list(pi.search("12", default_level=1, depth=1))
[2, 3, 4]

For level=0 only the children are included; for level>0 children and parent are included.
The docstring for search suggests that the second behaviour is correct - but I assume the the first behaviour is what is needed in many applications.

[rafaelbco]

I think this issue is related to this discussion: Why is plone.api.content.find() not returning the context object when depth=1?