[Fontconfig] How to disable the "global advance" for CJK fonts?

[Keith Packard]

Around 0 o'clock on Mar 19, Ambrose Li wrote:

> Honestly, in my collection of CJK fonts, the list of "exceptions"
> is about the same length as the list of correctly-handled fonts
> (if not longer).

I labeled it as an exceptional case because FreeType did (not to disclaim 
responsibility, but to notice that I used no first-hand knowledge of fonts 
when making this decision).

>From what people explained to me at the time, the font itself says whether 
to use global advance and this actually instructs FreeType to disregard 
that instruction.

Is there some sensible way to automatically tell whether global advance is 
giving bogus values?  I don't even care how expensive it is to compute as 
we can do it at font scan time instead of font load time.

-keith


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