Gets the filename for the icon. If the gtk.types.IconLookupFlags.UseBuiltin flag was passed to gtk.icon_theme.IconTheme.lookupIcon, there may be no filename if a builtin icon is returned; in this case, you should use gtk.icon_info.IconInfo.getBuiltinPixbuf.
the filename for the icon, or null if gtk.icon_info.IconInfo.getBuiltinPixbuf should be used instead. The return value is owned by GTK+ and should not be modified or freed.
Gets the filename for the icon. If the gtk.types.IconLookupFlags.UseBuiltin flag was passed to gtk.icon_theme.IconTheme.lookupIcon, there may be no filename if a builtin icon is returned; in this case, you should use gtk.icon_info.IconInfo.getBuiltinPixbuf.