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

[Eli Zaretskii]

> From: Kévin Le Gouguec <kevin.legouguec@gmail.com>
> Cc: rms@gnu.org,  schwab@linux-m68k.org,  psainty@orcon.net.nz,
>   luangruo@yahoo.com,  emacs-devel@gnu.org
> Date: Thu, 27 Jan 2022 09:13:37 +0100
> 
> Reading the documentation of the various glyphless-* knobs, I wonder if
> it would make sense to provide another group for
> glyphless-char-display-control?  'no-font is not helpful on my TTY, IIUC
> because terminal-coding-system says "utf-8-unix"?).
> 
> Maybe 'no-display, meaning (null (char-displayable-p CHAR))?

Isn't that what glyphless-char-display-control already does on a TTY
for no-font?  We just need to set up the table for such characters.

But I don't think that displaying the hex code is the best alternative
for this particular use case, as displaying the ASCII equivalents is
much better.