agronholm / anyio / 30152262441

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Fixed Path.with_stem() not validating an empty stem (#1200)

anyio.Path.with_stem() reimplemented the operation as with_name(stem + self.suffix) instead of delegating to
pathlib's own with_stem(). For a path with a non-empty suffix, an empty stem therefore produced a silently wrong path
(e.g. Path("foo.txt").with_stem("") -> Path(".txt")) rather than raising ValueError like pathlib.PurePath.with_stem() does.

The sibling wrappers with_name() and with_suffix() already delegate to self._path; with_stem() now does the same, restoring parity with pathlib for every input (empty-stem-with-suffix now raises, all other cases are byte-identical to before).

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Co-authored-by: Alex Grönholm <alex.gronholm@nextday.fi>
Co-authored-by: Tobias Petersen <tobias.alex.petersen@gmail.com>
Co-authored-by: NIYONSHUTI Emmanuel <nemmy0257@gmail.com>

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