bug#5081: zwj should not be ignored in indic text

[Kenichi Handa]

> ZWJ is required to display some characters (like Malayalam chillu or
> pure consonants) in many indic languages (Persian and Arabic also
> needs these characters). These should not be ignored while displaying
> indic text.

Please try to evaluate this:

(let ((script-regexp-alist
       `((devanagari . "[\x900-\x97F\x200C\x200D]+")
         (bengali . "[\x980-\x9FF\x200C\x200D]+")
         (gurmukhi . "[\xA00-\xA7F\x200C\x200D]+")
         (gujarati . "[\xA80-\xAFF\x200C\x200D]+")
         (oriya . "[\xB00-\xB7F\x200C\x200D]+")
         (tamil . "[\xB80-\xBFF\x200C\x200D]+")
         (telugu . "[\xC00-\xC7F\x200C\x200D]+")
         (kannada . "[\xC80-\xCFF\x200C\x200D]+")
         (malayalam . "[\xD00-\xD7F\x200C\x200D]+"))))
  (map-char-table
   #'(lambda (key val)
       (let ((slot (assq val script-regexp-alist)))
         (if slot
             (set-char-table-range
              composition-function-table key
              (list (vector (cdr slot) 0 'font-shape-gstring))))))
   char-script-table))

If it still doesn't work, please tell me the version numbers
of libotf and libm17n-flt, and also tell me which font is selected
for Malayalam.

% pkg-config --modversion libotf
% pkg-config --modversion m17n-flt

---
Kenichi Handa
handa@m17n.org