Re: 2.8.0 gitignore enhancement not working as expected

> Hi,
>
> I've been testing out git 2.8.0 rc3 due to having a particular interest in this enhancement from the changelog:
> " Another try to improve the ignore mechanism that lets you say "this
>    is excluded" and then later say "oh, no, this part (that is a
>    subset of the previous part) is not excluded".  This has still a
>    known limitation, though."
>
> Currently, in order to include ONLY the files under a/b/c I have the following in .gitignore:
> /*             - Ignore everything
> !/a             - Except directory "a"
> /a/*            - Ignore all sub-directories of "a/"
> !/a/b           - Except "a/b"
> /a/b/*          - Ignore all sub-directories of "a/b/"
> !/a/b/c         - Except "a/b/c"
>
> My hope was that with this enhancement I could massively simplify this to:
> /*             - Ignore everything
> !a/b/c      - Except "a/b/c"
>
> However this doesn't seem to work - instead I find that NOTHING is ignored (i.e. it's as if the 2nd line completely cancels the first).