how reliable is rendering of complex scripts?

[Werner LEMBERG]

Folks,


I wonder how reliable emacs displays complex scripts like Devanagari
or Arabic.  For example, the maintainers of the HarfBuzz library did
extensive comparisons of the rendering results with the MS engine to
iron out zillions of small buglets in OpenType handling.

AFAIK, Emacs relies on the m17n libraries, at least on GNU/Linux (no
idea about other environments), controlling the OpenType handling
(partially?) with Lisp code – are there test suites to compare the
results?


    Werner