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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: emacs-27 7ec66a5: Document spacing issues with Xft for some fonts
Date: Tue, 14 Jan 2020 17:31:46 +0200
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> From: Robert Pluim <rpluim@gmail.com>
> Date: Tue, 14 Jan 2020 15:17:45 +0100
> Cc: emacs-devel@gnu.org
> 
>     Stefan> Does the use of Harfbuzz affect the result?
> 
> I see this in an XFT build both with and without Harfbuzz.

Which is expected: we only call HarfBuzz for character composition,
not for "simple" text such as ASCII.  Otherwise, we use the glyph
metrics as returned by the lower-level facilities, in this case the
Xft API that returns the "text extents".