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

[Eli Zaretskii]

> Date: Tue, 25 Jan 2022 08:35:42 +0200
> From: Eli Zaretskii <eliz@gnu.org>
> Cc: psainty@orcon.net.nz, luangruo@yahoo.com, emacs-devel@gnu.org
> 
> On January 25, 2022 6:16:29 AM GMT+02:00, Richard Stallman <rms@gnu.org> 
> wrote:
> >
> >   >   When several characters are supposed to
> >   > be composed on a text-mode display, Emacs simply writes them to the
> >   > terminal one after another, and expects the terminal to display them
> >   > as a ligature.  The only difference between what Emacs does in this
> >   > case and what it does when no character composition is expected is
> >   > that in the former case Emacs expects the terminal to produce just one
> >   > glyph that takes just one column on display.
> > 
> > In that case, I think I it would be good to be able to tell Emacs,
> > when using a text-only terminal, not to try to compose ligatures.
> > Not to expect that sequence to display as one column.  Is that possible?
> > 
> 
> This should already work: auto-composition-mode's value can be a symbol, to 
> allow disabling that mode on uncapable terminals.

Sorry, not a symbol, but a string -- the name of the terminal type as
returned by tty-type.