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Re: Emacs 27.1 Windows Binaries -- testing wanted

From: Eli Zaretskii
Subject: Re: Emacs 27.1 Windows Binaries -- testing wanted
Date: Mon, 24 Aug 2020 13:40:27 +0300

> From: Robert Pluim <rpluim@gmail.com>
> Cc: phillip.lord@russet.org.uk,  emacs-devel@gnu.org
> Date: Mon, 24 Aug 2020 11:28:43 +0200
> >>>>> On Fri, 21 Aug 2020 22:44:18 +0300, Eli Zaretskii <eliz@gnu.org> said:
>     >> Obviously more features to go. I haven't worked out how to test the 
>     >> existence of harfbuzz yet.
>     Eli>   (car (frame-parameter nil 'font-backend))
> There are vendor-provided versions of Emacs that mess with
> font-backend and/or FontBackend, and the user may have changed it
> themselves, so thatʼs not going to work.

I'm not sure I understand the "mess" part.  Can you show an example of
what such "messing" produces in the simple recipe I suggested above?

Also, I'm guessing those vendors don't touch the Windows builds, do

> Perhaps we need a `harfbuzz-available-p` defun?

We could add that if there's a reason good enough.  The advantage of
what I proposed is that it also detects the cases where HarfBuzz is
available, but for some reason not used.

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