bug#22786: 25.1.50; eww arabic rendering

[Lars Ingebrigtsen]

Eli Zaretskii <eliz@gnu.org> writes:

> There was a subtle bug in bidi.c which affected this case, now fixed
> on the emacs-25 branch.  With that, you should see the expected result
> in the above example.

Great.

>> Anyway, this reminds me: Do we have a literal char syntax for these
>> control characters?
>
> Do we have a literal syntax for _any_ character?

We have ?\s (presumably because people found ?  too annoyingly
fragile).  Thinking about it a bit more, I think it would be kinda nice
to have a literal syntax for all Unicode characters.  Something like...
er...  ?\ucLEFT-TO-RIGHT-OVERRIDE and \?ucPILE-OF-POO?  We have that
table already, so perhaps that's feasible?

But it's, of course, more important for the control characters, because
they're just incomprehensible if you just ?💩 them...

> Btw, these controls display as thin spaces on GUI frames, and as just
> spaces on a TTY; for best results you could cover each control with an
> invisible text property, which would make them entirely invisible.

Hm...  perhaps it's good to (vaguely) show that they're there?  I'm not
sure.

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no