Creates a filename representation of a font description.
The filename is identical to the result from calling
pango.font_description.FontDescription.toString_, 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 pango.font_description.FontDescription.toString_, but with underscores instead of characters that are untypical in filenames, and in lower case only.