Up_gtkFontStyleSet
_gtkFontStyleSet defines the style of a Font object.
Prototype : fun [ObjGtkFont I] ObjGtkFont
- ObjGtkFont : any Font object
- I : one of these following values :
- FONT_STYLE_NORMAL (default)
- FONT_STYLE_OBLIQUE
- FONT_STYLE_ITALIC
- Return ObjGtkFont : the same Font object or nil if an error occurs.