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

[Tomas Hlavaty]

On Sat 05 Feb 2022 at 16:06, Eli Zaretskii <eliz@gnu.org> wrote:
>> char-displayable-p returns non-nil even though I see boxes.
>
> Is this the Linux console or is this a terminal emulator?

linux console

> If it's a console, does it support the ioctl issued by
> calculate_glyph_code_table?

how can i say?

> Also, these calls are incorrect:
>
>  (char-displayable-p ?ã¯)
>  (char-displayable-p ?ã˘)
>
> char-displayable-p accepts a single character, not 2.

I see boxes, not characters.  I wasn't sure if 1 box ~ 1 char, always.
That's why I sent also results with the two boxes separated, one test
for each part.