bug#34035: 26.1; Arabic shadda-kasrah renders incorrectly

[Eli Zaretskii]

> From: "Peter" <craven@gmx.net>
> Date: Thu, 10 Jan 2019 18:20:32 +0100
> 
> - Start emacs -Q
> - C-\ arabic RET
> - s ~ A (sin shadda kasrah) repeat a few times
> 
> The kasrah (short slash below the letter) should be shown below the
> shadda (the squiggle above the letter) and above the letter, not below
> it.
> 
> I've tried different fonts, this seems to be a problem with emacs
> itself, other editors and firefox render the same text (copy-pasted)
> correctly.
> 
> See attached screenshot for what it looks like in Emacs and in Firefox.

Thanks.  On my system, this is displayed correctly, with kasrah above
the letter.  So I don't think it's Emacs, I think it's the shaping
engine you are using.  As you didn't provide the information collected
by "M-x report-emacs-bug", I can only guess what is that shaping
engine: XFT and libflt, right?  Maybe you could try building the
harfbazz branch, which uses HarfBazz for shaping, I'd expect this
problem not to exist there.