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bug#20984: 25.0.50; Combining accents don't display properly in certain

From: Artur Malabarba
Subject: bug#20984: 25.0.50; Combining accents don't display properly in certain fonts
Date: Sun, 5 Jul 2015 19:02:19 +0100

>> Should I paste the full *help* buffer here?
> There's no need, thanks.  But it would be interesting, I think, to see
> the output of "C-u C-x =" for the same pair of inserted characters,
> but with your default font (assuming it is capable of displaying the
> accented a).

With my default font (DejaVu Sans Mono), which does correctly display
the grave a, describing the combined characters gives the following

Composed with the following character(s) "̀" using this font:
  xft:-unknown-DejaVu Sans Mono-normal-normal-normal-*-15-*-*-*-m-0-iso10646-1
by these glyphs:
  [0 1 97 68 9 1 8 11 0 nil]
  [0 1 768 648 0 2 6 12 -9 [-9 0 0]]

And describing them individually gives the following

xft:-unknown-DejaVu Sans
Mono-normal-normal-normal-*-15-*-*-*-m-0-iso10646-1 (#x44)
xft:-unknown-DejaVu Sans
Mono-normal-normal-normal-*-15-*-*-*-m-0-iso10646-1 (#x288)

> Anyway, I've tried this on my system, after installing version 1.020
> of the font, and I don't see the problem you report: the 2 characters
> are composed and displayed as you'd expect.
> So I think this might be some issue with the shaping engine you are
> using -- do you have the latest versions of the libraries mentioned in
> INSTALL, under "Complex Text Layout support libraries"?  If you do,
> perhaps Handa-san could comment on this.

Out of the 3 mentioned there ("m17n-db", "libm17n-flt", "libotf")
- I see the following 2 installed (and up-to-date) on my system
(arch): m17n-db, m17n-lib, libotf.
- Looking through my emacs's config.log, I see reports that the
following two were detected: M17N_FLT, LIBOTF.

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