bpo-39897: Remove needless Path(self.parent) call, which makes is_mount() misbehave in Path subclasses#18839
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pathlib.Path.is_mount()callsPath(self.parent), which:self.parentis already a Path instance!self.parentmay be aPathsubclass with its ownstat()implementationThis patch makes
is_mount()useself.parentdirectly.https://bugs.python.org/issue39897