bug#51658: [PATCH] Haiku port (again)

[Eli Zaretskii]

> From: Po Lu <luangruo@yahoo.com>
> Cc: 51658@debbugs.gnu.org
> Date: Thu, 11 Nov 2021 08:27:18 +0800
> 
> The haikufont backend will use whatever shaping engine is used by the
> App Server (the window server on Haiku).  Right now, it can't do any
> fancy shaping, but the Haiku developers plan to add HarfBuzz in the
> future.
> 
> Once that is done, then the haikufont backend will support HarfBuzz
> without any further work.
> 
> > I hope you will reconsider.  Having a niche platform with 3 font
> > backends is really too much.  Especially since Emacs 29 learned to
> > display Emoji now, and we are talking about adding decent support for
> > ligatures, both of which require a shaping engine.
> 
> OK, so WDYT about keeping haikufont and Cairo support?  Please let me
> know, and I'll update the patch.  Thanks in advance!

SGTM, thanks.