> From: Behdad Esfahbod <behdad@behdad.org>
> Date: Wed, 15 May 2019 16:02:19 -0700
> Cc: contovob@tcd.ie, Kenichi Handa <handa@gnu.org>, 
> 	Khaled Hosny <dr.khaled.hosny@gmail.com>, 35721@debbugs.gnu.org
> 
> Pretty much things you said: if font is not mono-spaced, there's nothing we can do.

Thanks.  Let me be sure I understand what you are saying.  If I invoke
hb-view like this:

  hb-view -u 0x0634 -O png -o sheen.png DejaVuSansMono.ttf

then the result is the following PNG image: