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

[Richard Stallman]

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  > We don't have a way of determining whether a terminal can display
  > ligatures.

Could we do it via terminfo?  We can define any capabilities we like.

  > > I doubt any user wants to see a diamond instead of `fi'.

  > Is this what really happens for you, on your terminal?

Yes.  A few days ago I put point on a diamond, typed C-u C-x =,
and was told it was a ligature for `fi'.

I didn't save details of what text I was looking at,
but I suspect it was a web page that a script fetched and
emailed to me.

-- 
Dr Richard Stallman (https://stallman.org)
Chief GNUisance of the GNU Project (https://gnu.org)
Founder, Free Software Foundation (https://fsf.org)
Internet Hall-of-Famer (https://internethalloffame.org)