Eli Zaretskii <eliz@gnu.org> schrieb am Fr., 15. Juni 2018 um 10:35 Uhr:

>
> > I looked at the code and it looks to me like there is a very obvious bug
> >  in function buffer_chars_equal in editfns.c. It calls
> >  BUF_FETCH_CHAR_AS_MULTIBYTE passing *character* positions, but the
> >  macro expects *byte* positions. (it would be nice if these char vs byte
> >  positions could be distinguished with types, but I'm not sure it is
> >  possible in C).
> >
> > The simple fix is to replace BUF_FETCH_CHAR_AS_MULTIBYTE with
> >  STRING_CHAR (BUF_CHAR_ADDRESS (buf, pos)) and this seems to work.
>
> Thanks, I installed a slightly different fix on the emacs-26 branch,
> perhaps you could try that.


Thanks a lot for finding and fixing this (rather embarrasing) bug!