For the record, I still believe the commonprefix of a pair of identical paths
should be the path itself as it is the longest sub-component of these paths.
> > + $ hg debugtemplate '{"foo/bar\nfoo/bar\n"|splitlines|commonprefix}\n'
> > + foo
>
> should be "foo/bar"
And removing the leading slash is awkward.
> > + $ hg debugtemplate '{"/foo/bar\n/foo/bar\n"|splitlines|commonprefix}\n'
> > + foo
>
> should be "/foo/bar"
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