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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