[XeTeX] bug in polyglossia/sanskrit? (problem with diacritical marks)

[Ulrike Fischer]

Am Mon, 13 May 2019 17:52:17 +0200 schrieb François Patte:

> I have just made a fresh install of texlive 2019 and encountered a
> problem with the diacritical marks of romanized sanskrit.

(copied from f.c.t.t):

One can see it with plain xetex too, and it is not the font (I'm
forcing it to 2018), et it is not xdvipdfmx (it happens with tl19
and tl18 version). So it is quite probably an xetex engine bug. 

A plain xetex example:

\XeTeXtracingfonts=1
\font\test="[C:/texlive/2018/texmf-dist/fonts/opentype/public/gnu-freefont/FreeSerif.otf]/OT:script=dev2;"
\test  ā ī ū ṛ ṝ ḷ ḹ ṭ ḍ ṅ ś ṣ ḥ
\bye


Comparing the versions gives
2019:
Compiled with ICU version 63.1; using 63.1
Compiled with zlib version 1.2.11; using 1.2.11
Compiled with FreeType2 version 2.9.1; using 2.9.1
Compiled with Graphite2 version 1.3.13; using 1.3.13
Compiled with HarfBuzz version 2.3.1; using 2.3.1
Compiled with libpng version 1.6.36; using 1.6.36
Compiled with poppler version 0.68.0
Compiled with fontconfig version 2.13.1; using 2.13.1

2018:
Compiled with ICU version 61.1; using 61.1
Compiled with zlib version 1.2.11; using 1.2.11
Compiled with FreeType2 version 2.9.1; using 2.9.1
Compiled with Graphite2 version 1.3.11; using 1.3.11
Compiled with HarfBuzz version 1.7.6; using 1.7.6
Compiled with libpng version 1.6.34; using 1.6.34
Compiled with poppler version 0.64.0
Compiled with fontconfig version 2.13.0; using 2.13.0

The first suspect is HarfBuzz. 




-- 
Ulrike Fischer 
https://www.troubleshooting-tex.de/