bug#43363: 27.1; Wrapped comment line that contains cyrillic text is displayed in different colors

[Eli Zaretskii]

> From: Драгољуб Шишовић <dragoljub.sisovic@gmail.com>
> Date: Tue, 15 Sep 2020 14:37:18 +0200
> Cc: 43363@debbugs.gnu.org
> 
> I haven't seen this problem with any other characters, only when commenting 
> with Cyrillic letters and with
> word wrapping.
> 
> Not sure if this can help in tracking down the cause of the problem, but I've 
> tested emacs 27.1 on a different
> computer and I've managed to replicate the issue. However, it had a clean 
> Manjaro install (which is Arch
> based distro, and I assume they use pretty much the same libraries). Also, 
> I've tried a number of other
> distros in VirtualBox (Fedora, Kubuntu...) and I've managed to replicate the 
> exact problem on each and single
> one of those virtual machines.
> 
> When I downgraded to emacs 26, to test the issue, I was using the same system 
> libraries like with emacs
> 27. And, as I understand, the only difference is with cairo, harfbuzz (emacs 
> 27) and libmagick6 (emacs 26).
> Also, I have experimented with different GTK settings, with font 
> antialiasing, hinting, sub-pixel geometry, but
> nothing helps. The issue manifests even without X11 started, in plain command 
> line mode.

Well, someone who can reproduce the issue will have to debug it.  I
cannot reproduce this, so I cannot debug it.