🐛 Themes whose names have uppercase letters are silently ignored

[Tak]

If I create a theme feature in .gitconfig (or an included file) named like [delta "Tak"], it will be silently ignored (also in e.g. --show-themes)

This appears to be a result of force-lowercasing in some places for comparison and doing original-case lookups in other places.

Obviously there's an easy workaround, but it took quite a while to find out why my theme wasn't getting picked up. 🙂

[dandavison]

Hi @Tak, oops! OK, thanks very much for the report; will fix. (Of course, if you feel like a Rust PR, go for it also!)