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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: Help with unicode diacritics
Date: Mon, 28 Dec 2020 16:48:05 +0200
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In-Reply-To: <87im8mvyem.fsf@cam.ac.uk> (message from Stephen Eglen on Mon, 28
 Dec 2020 13:43:45 +0000)
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> From: Stephen Eglen <sje30@cam.ac.uk>
> Date: Mon, 28 Dec 2020 13:43:45 +0000
> Cc: Help GNU Emacs <help-gnu-emacs@gnu.org>, Stephen Eglen <sje30@cam.ac.uk>
> 
> In the meantime, I've also found this old bug report but that seems to
> predate the harfbuzz implementation now in 27.1:
> 
> > https://lists.gnu.org/archive/html/bug-gnu-emacs/2015-07/msg00334.html

I don't think that old bug is related to what you see, for two
reasons:

  . the bug was in libm17n-flt, and you are using HarfBuzz
  . the basic rule that Emacs only composes characters supported by
    the same font doesn't depend on the text-shaping engine, so it
    cannot be fixed in one particular engine

You need to find a better font.