bug#41005: problem with rendering Persian text in Emacs 27

[hossein valizadeh]

HarfBuzz version is  2.6.7
XMODIFIERS=''  make no difference.
Text used in these screenshots are  https://time.ir  in  EWW mode. (help buffer content displayed in screenshots)

i will try on master branch and  report the result.

On Thu, Jun 4, 2020 at 8:40 AM Eli Zaretskii <eliz@gnu.org> wrote:

On June 4, 2020 7:01:30 AM GMT+03:00, Eli Zaretskii <eliz@gnu.org> wrote:
> On June 4, 2020 6:01:21 AM GMT+03:00, hossein valizadeh
> <valizadeh.ho@gmail.com> wrote:
> > Hello,
> >
> > 1. This happen with every font that supports Arabic.
> > 2. When scale back to zero the problem happen again.
> >
> > I attached my emacs-bug-info.
> >
> >
> > On Thu, Jun 4, 2020 at 7:09 AM hossein valizadeh
> > <valizadeh.ho@gmail.com>
> > wrote:
> >
> > > Hello,
> > >
> > > 1. This happen with every font that supports Arabic.
> > > 2. When scale back to zero the problem happen again.
> > >
>
>
> Thanks.
>
> What is your version of HarfBuzz?
> And what happens if you unset XMODIFIERS, i.e. disable the ibus input
> method framework?

Also, please go to the problematic place in the text and type "C-u C-x =", then post everything that Emacs shows in the *Help* buffer as result.  Please do this both at text scale zero, when shaping is incorrect, and at non-zero scale, and post the contents of *Help* in both cases.

Screenshots of both displays as well as the text of the buffer used for these experiments will also help, as mentioned earlier

And finally, please try this with the version on the master branch, where a few fixes were installed lately.

zero-scale.png
Description: PNG image

none-zero-scale.png
Description: PNG image