Fallback to known font dir paths if none were loaded via fontconfig #71
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In cases where parsing fontconfig conf files may fail, or no font dirs
would be loaded for some other reason, it could be useful to fallback
to the non-fontconfig mechanism of trying to load from some fixed
known font dir paths.
A case where a distribution botched fontconfig conf files with an
upgrade was seen in pop-os/cosmic-term#323. And while Nix users in
particular may not have benefited from this change. I think
the scenario is plausible enough to occur via distribution or user
error.
The benefit of things probably working, at least partially, with and
without fontconfig's help is a big plus IMHO.