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Display of Lao script

From: Stephen Berman
Subject: Display of Lao script
Date: Tue, 17 Oct 2017 01:14:03 +0200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/27.0.50 (gnu/linux)

I had Emacs (built from current master) on a system on which the m17n
and otf libraries were not installed; after installing these libraries I
rebuilt Emacs and noticed that the example of Lao script in the HELLO
file looks different than it does without these libraries.  Here's a
screen shot from the Emacs built without these libraries:

Attachment: Lao-m17n.png
Description: PNG image

And here's one with from the Emacs built with these libraries:

Attachment: Lao+m17n.png
Description: PNG image

Is this difference expected?  I'm not familiar with the Lao script, so I
don't know if one of the displays is wrong, though this quote from
https://en.wikipedia.org/wiki/Lao_alphabet seems to suggest that either
way is possible: "Vowels can be written above, below, in front of, or
behind consonants, with some vowel combinations written before, over and
after."  This is m17n-lib-1.7.0 and libotf-0.9.13 from
http://www.nongnu.org/m17n/, which are AFAIK the latest released
versions (there's a patch for Bengali in etc/PROBLEMS, but I don't know
of any problem report about Lao).  (Regardless if what's correct, my
aesthetic impression is that the first display, without m17n and libotf,
looks better; however, I do know that the Arabic example in HELLO is
correctly displayed only with these libraries).

Steve Berman

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