[issue13968] Support recursive globs

[Yuval Greenfield]

Yuval Greenfield <ubershmekel at gmail.com> added the comment:

> This would be quirky. I don't think '..' should be treated specially.
> (there's also the symlinks problem)

Again with 'a/b/c/d' and let's add a file 'a/b/png'.

If the curdir is 'c' and you use rglob('../pn*') you won won't find '../png' as you would be walking only in the curdir. I think that route would mean we should document double dots aren't supported.

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