Re: Can watermarking Unicode text using invisible differences sneak through Emacs, or can Emacs detect it?

[Yuri Khan]

On Fri, 4 Feb 2022 at 10:53, Richard Stallman <rms@gnu.org> wrote:

> C-x 8 RET recognizes
> LATIN SMALL LETTER A WITH BREVE AND TILDE
> but it does not recognize
> LATIN SMALL LETTER A WITH TILDE AND BREVE
>
> Is the failure to handle the latter a bug?

Not necessarily. Unicode does not assign single-character codes to all
possible letter and diacritic combinations. Instead, it has various
combining diacritics that apply to the nearest preceding non-combining
character. So a with tilde and breve could be encoded as a sequence
<Latin small letter A> <combining tilde> <combining breve> or <Latin
small letter A with tilde> <combining breve>.