bug#50402: 27.0.90; column-number-mode breaks Farsi/Arabic character shaping

[Eli Zaretskii]

> From: Mohammad Razavi <sepent@gmail.com>
> Date: Sun, 5 Sep 2021 14:43:02 +0430
> 
> As you may know in scripts such as Farsi (Persian) or Arabic characters
> may change shape depending on their adjacent characters
> (http://www.unicode.org/versions/Unicode1.0.0/V2appA.pdf).
> 
> 
> This behavior works fine in emacs; but if you enable
> "column-number-mode" and copy/paste Farsi/Arabic script into the buffer
> character shaping will not work correctly.

This is bug#41005, which was solved in Emacs 27.1.  You are running a
pretest of Emacs 27.1, from before that bug was solved.  Please
upgrade to Emacs 27.1 or 27.2, and I believe the problem you see
should go away.

Thanks.