group.name in the key file
key.file.gtkPaperSizeNewFromKeyFile(key.file, group.name, .errwarn = TRUE)key.fileGKeyFile to retrieve the papersize fromgroup.nameNULL to read the first groupGtkPaperSize] a new GtkPaperSize object with the restored
paper size, or NULL if an error occurred.errorNULL. [ allow-none ]