fix discover upwards to cwd #2189
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The upwards search for the repository directory takes a directory as input and then walks through the parents. It turns out that it was broken when the repository was the same as the working directory. The code checked when the directory components had been stripped to "", in case the directory was replaced with `cwd.parent()`, so the loop missed to check `cwd` itself. If the input directory was "./something", then "." was checked which then succeeded.
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supersedes #2184, needed as I can't push there.