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gh-93156 - fix negative indexing into absolute `pathlib.PurePath().parents` (GH-93273)
When a `_PathParents` object has a drive or a root, the length of the object is *one less* than than the length of `self._parts`, which resulted in an off-by-one error when `path.parents[-n]` was fed through to `self._parts[:-n - 1]`. In particular, `path.parents[-1]` was a malformed path object with spooky properties. This is addressed by adding `len(self)` to negative indices. (cherry picked from commit f32e6b48) Co-authored-by:Barney Gale <barney.gale@gmail.com>
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