Suppose there's a subdirectory named |`MÜNCHEN`| in the current
directory, then tab-completion won't recognize this directory, when |`cd
münchen`|+ [tab] is given.

I noticed this behavior when attempting to |cd| the given directory
(with tab autocomletion), and while doing the same with `|rm -r`|.

I assume, *it's a zsh-wide issue due to broken case-insensitive matching
umlauts.*

I'd like to provide some patch, but I was unable to figure out, where
the bug is caused.

Thanks,
Luis
**