bug#8145: Crash in multibyte_chars_in_text

[Michel de Ruiter]

> > FWIW, I cannot reproduce this.  I don't have a U: drive, and couldn't
> > make a directory with a Latin character (my locale is different), but
> > I did create a directory on D: with a non-ASCII character it its name,
> > and in that directory put an empty file "ab".  "C-x C-f cd" didn't
> > crash.
> I can reproduce it using C: instead of U: with an unpatched build:
> GNU Emacs 24.0.50.1 (i386-mingw-nt5.1.2600) of 2011-02-15

I just tested C:\aAaaé\aa and it also crashes.
The capital letter and the latin character are both necessary.
In C:\aAé\aa, Ctrl-x Ctrl-f crashes immediately, before I can type any extra 
characters.

This seems to be the shortest way to the crash:
- set both settings to t as described
- Ctrl-x Ctrl-f A Ctrl-q 1 3 0 RET
Works everywhere, and you don't need any special directory on disk.

Groente, Michel.