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

[Eli Zaretskii]

> From: Richard Stallman <rms@gnu.org>
> Cc: eliz@gnu.org, psainty@orcon.net.nz, luangruo@yahoo.com,
>       emacs-devel@gnu.org, kevin.legouguec@gmail.com
> Date: Wed, 26 Jan 2022 23:13:47 -0500
> 
> I disagree.  These Unicode values are not ordinary, not just like any
> other.  They are special because each of them represents a ligature of
> two ASCII characters, which could just as well be presented as a
> series of two characters.

Note that there are precomposed codepoints for ligatures of 3 ASCII
characters as well, for example U+FB03 LATIN SMALL LIGATURE FFI.

> When it is impossible to display the character's ligature, it would be
> more useful to display the two ASCII characters than to display an
> unhelpful diamond.
> 
> We should try to do what is most helpful, not be quick to give up.

Would it be good enough to have a command that will arrange for these
ligatures to be displayed as their ASCII equivalents, using the
facilities in latin1-disp.el?  Such a command could be invoked either
manually or from your init file.  latin1-disp.el also provides a
special face to display such equivalents, so you could have them stand
out on display if you want.