Eli Zaretskii <eliz@gnu.org> writes:

>> From: hossein valizadeh <valizadeh.ho@gmail.com>
>> Date: Fri, 5 Jun 2020 17:02:55 +0430
>> Cc: pipcet@gmail.com, 41005@debbugs.gnu.org, 
>> 	Nicholas Drozd <nicholasdrozd@gmail.com>
>> 
>> I'm sorry, my English is so bad, at least in writing. That's why it's
>> hard for me to give a full explanation.
>
> Your English is entirely adequate, there's nothing for you to be
> ashamed of.
>
> Thanks for the details, I think they point to the code identified by
> Pip Cet, which is called from current-column and similar APIs.  A fix
> will probably be available soon.

I think the attached patch is a fairly minimal fix; it's against master,
applies to emacs-27 but I haven't tested it there.

Given these two bugs, I wonder whether it wouldn't be more reasonable
always to let HarfBuzz guess the direction, at least for Emacs-27:
scripts which change direction, if they are supported by HarfBuzz, won't
work anyway.

Or am I missing something?