bug#6003: Conjunct 'sple' (as in display) in Malayalam (സ്പ്ലെ) is not rendered correctly

[Eli Zaretskii <eliz@gnu.org>]

> From: Lars Ingebrigtsen <larsi@gnus.org>
> Date: Tue, 01 Oct 2019 17:50:06 +0200
> Cc: 6003@debbugs.gnu.org
> 
> Praveen A <pravi.a@gmail.com> writes:
> 
> > We discussed this bug at Red Hat bugzilla
> > https://bugzilla.redhat.com/show_bug.cgi?id=543906 and the fix
> > provided works for pango but fails in emacs. This request is to add
> > ccmp feature to m17n rendering engine.
> >
> > Similar request for harfbuzz https://bugs.freedesktop.org/show_bug.cgi?id=27485
> 
> (I'm going through old bug reports that unfortunately didn't get any
> response at the time.)
> 
> Looking at the redhat bug report in Emacs, it seem like the characters
> are displayed correctly -- at least as far as I can tell from this:
> 
> --
>   3. type ഡിസ്പ്ലെ (സ്പ്ലെ = unicode raw 0d38, 0d4d, 0d2a, 0d4d, 0d32)
> 
>   Actual results:
>   സ്പ and ലെ displayed separately
> 
>   Expected results:
> 
>   സ് and പ്ലെ rendered separately
> --
> 
> Has this started working better in the years since this bug was
> reported?  (And Emacs uses harfbuzz in Emacs 27 now, so perhaps that
> explains it...)

Yes, I think HarfBuzz gets this right.