Creates a filename representation of a font description.
The filename is identical to the result from calling
[method@Pango.FontDescription.to_string], but with underscores
instead of characters that are untypical in filenames, and in
lower case only.
Creates a filename representation of a font description.
The filename is identical to the result from calling [method@Pango.FontDescription.to_string], but with underscores instead of characters that are untypical in filenames, and in lower case only.