pathlib ABCs: `ReadablePath.glob('')` doesn't add trailing slash

[barneygale]

Bug report

Minor issue in some still-private code.

In the pathlib ABCs, ReadablePath.glob('') should work a bit like JoinablePath.joinpath(''), i.e. it should yield the path with a trailing slash if it's an existing directory. This isn't presently the case, because the globbing implementation tries to defer adding trailing slashes, for basically no good reason.

Most easily reproduced by running DummyReadablePathTest.test_glob_empty_pattern(), which currently asserts the wrong result (!)

Linked PRs

• GH-129835: Yield path with trailing slash from ReadablePath.glob('') #129836