commit: Correct case-insensitive search for non-case, non-ASCII chars. Add tests.

[Michael Sperber]

Aidan Kehoe <kehoea at parhasard.net> writes:

>  Ar an t-aonú lá is triochad de mí Eanair, scríobh Michael Sperber: 
>
>  > Let me know if you need more info---I couldn't convince gdb on my Mac OS
>  > X box to produce a backtrace right away, but I'll have more time
>  > tomorrow.
>
> Ideally, I’d like the entire buffer being searched, together with the output
> of M-: (current-case-table) RET, both saved using escape-quoted. I can’t
> provoke an assertion failure with 
>
> (search-forward "Patrick Mézard <pmezard at gmail.com>" nil t)
>
> on its own, so I need more context.

The buffer is empty.  I can reproduce the problem by creating a vanilla
empty buffer, and then doing M-: (search-forward ...).

-- 
Cheers =8-} Mike
Friede, Völkerverständigung und überhaupt blabla