Load a set of fonts in the fontmap that can be used to render a font matching @desc.
the #PangoContext the font will be used with
a #PangoFontDescription describing the font to load
a #PangoLanguage the fonts will be used for
Return: the newly allocated #PangoFontset loaded, or %NULL if no font matched.
See Implementation
Load a set of fonts in the fontmap that can be used to render a font matching @desc.