This is more likely to get some response from the main git mailing
list I think. It is not specifically msysgit related.
> So, from the response of Thomas RAST [1], the problem come from the bash
> version.
> Completion is working for him with bash 4.2.10, but is broken with bash
> 3.1 and 4.0-rc1.
> Maybe msysGit should embed a newer version of bash.
Upstream MSYS only has bash-3.1.17-4 [1], so unless someone is willing
to contribute an mingw-get package to MSYS, it's highly unlikely msysGit
will come with a newer bash version.
[1] http://sourceforge.net/projects/mingw/files/MSYS/Base/bash/
--
Sebastian Schuberth