[Fontconfig] blacklisting doesn't work

[Matthias Clasen]

So, I tried to figure out why my fc-list output includes the Hershey
fonts, even though 40-blacklist-fonts.conf is included and read. 
First I figured out that the glob patterns in
the /etc/fonts/conf.d/40-blacklist-fonts.conf file we ship don't have
any effect, since fontconfig does not actually apply globs
to individual fonts. The globs in <rejectfont> are only applied to
directories, and the patterns in <rejectfont> are what is applied to
the individual fonts. So I tried to change the blacklist to a series 
of patterns like

    <rejectfont>
      <pattern>
        <patelt name="family">
           <string>Hershey\-Gothic\-English</string></patelt>
      </pattern>
    </rejectfont>

And the Hershey fonts were still there. It took me quite a while
to figure out that I need to strip the escapes out of the fc-list 
output to give the patterns a chance to work. Is that escaping 
really necessary ? It is certainly confusing...

Anyway, after stripping the escapes out of the patterns, the
Hershey fonts still would not vanish. I finally came to the 
conclusion that something like the patch below will be necessary
to make blacklisting work again.

Matthias



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