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bug#44528: New bidi problems with outline-mode (Arabic, Hebrew,..)

From: Fr Ml
Subject: bug#44528: New bidi problems with outline-mode (Arabic, Hebrew,..)
Date: Tue, 17 Nov 2020 11:04:05 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.12.0

I've made a new installation of Emacs (from the repository with pacman) and I've noticed that m17n-db and libotf are installed implicitly (because of dependency) with Emacs.
Could this cause a problem with Harfbuzz (which is also installed implicitly with Emacs)?

On 11/12/20 3:30 PM, Eli Zaretskii wrote:
Cc: 44528@debbugs.gnu.org
From: Fr Ml <fr_ml@t-online.de>
Date: Thu, 12 Nov 2020 08:14:30 +0100

in the INSTALL instruction of Emacs we read:
(On GNU and Unix systems, Emacs needs the optional libraries "m17n-db",
"libm17n-flt", "libotf" to correctly display such complex scripts as
Indic and Khmer, and also for scripts that require Arabic shaping
support (Arabic and Farsi).)

But I noticed that libm17n-flt isn't installed and it's not a package in the repository of Archlinux . I didn't need
to install it before.

Can it be the problem? Or is it included in the other packages (m17n-db, libotf)?
This text is outdated: we nowadays prefer HarfBuzz, if available, as
our shaping engine.  Is your build using HarfBuzz?  You can tell by
looking at the value of the variable 'system-configuration-features'.

If your build doesn't use HarfBuzz, I suggest to install one that

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