bug#40502: 28.0.50; Hangul Jamo conjoining characters are not composed

[Eli Zaretskii]

> From: Robert Pluim <rpluim@gmail.com>
> Date: Wed, 08 Apr 2020 11:28:25 +0200
> 
> According to Unicode 13 Chapter 18.6, Hangul Jamo characters should be
> composed into the corresponding pre-composed Hangul characters. Iʼm
> not seeing this, e.g
> 
> 하 (U+1112 U+1161) should be displayed as 하 (U+D558), but is shown as
> two separate glyphs (all using Apple SD Gothic Neo)

I hope I've just fixed that on the master branch, please take a look.

> (set-char-table-range composition-function-table
>                       #x1112
>                       (list (vector "..")
>                             0
>                             'compose-gstring-for-graphic))
> 
> does not help.

The call is incorrect: 'vector' should include both 0 and the function
symbol.

Thanks.