The following minimal example used to work fine:
\starttypescript [serif] [zhfonts]
\definefontsynonym [Serif] [name:nsimsun]
\stoptypescript
\starttypescript [zhfonts]
\definetypeface [zhfonts] [rm] [serif] [zhfonts]
\stoptypescript
\usetypescript [zhfonts]
\setupbodyfont [zhfonts, rm, 11pt]
\starttext
测试
\stoptext
but it's no longer the case.
The font used here is 'simsun.ttc' which ships with Chinese edition
Windows systems by default.
When I require "name:nsimsun" as above, the TTFAddLangStr() function in
the luatex code base will have the following information:
fontname lang
NSimSun 0
NSimSun 1033
新宋体 2052
That is when lang equals 0 or 1033, the fontname will be NSimSun, but
when lang equals 2052, the fontname will be 新宋体, the Chinese words
for NSimSun.
Although the ValidatePostScriptFontName() complains about the Chinese
name of this font, and set 'bad_ps_fontname' to true, luatex itself
don't stop the font fromgetting the right fontname NSimSun, since it
chooses ASCII names when there're multiple fontnames.
But actions["check metadata"](font-otf.lua, 1812)，sets the
metadata.fontname from the correct "NSimSun" to "bad-fontname-simsun",
and this change causes ff_get_ttc_index() to always return -1 as the
index, which caused ConTeXt to complain about the following error
message before bail out:
(bad-fontname-simsun:-1)Invalid TTC index number
mtx-context | fatal error: return code: 1
So, maybe font-otf.lua may need not change metadata.fontname and
metadata.fullname if these two names are not nil?
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