[Fontconfig] Matching font by unicode coverage

[Sam Varshavchik]

David Lattimore writes:

> Matching with an FC_CHARSET works for me. No idea if what I'm doing is right,  
> but roughly what I do is:
> - Identify script for each character  
> (using <URL:http://unicode.org/Public/UNIDATA/Scripts.txt>http://unicode.org/ 
> Public/UNIDATA/Scripts.txt)
> - Split runs based on script (so that no run has two different scripts)
> - Build an FC_CHARSET for the run.
> - Match and use the resulting font.

That seems to be exactly what I'm looking for, thank you.

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