to_key_file

Description:

public void to_key_file (KeyFile key_file, string? group_name)

This function adds the page setup from this to key_file.

this	a `GtkPageSetup`
key_file	the `GKeyFile` to save the page setup to
group_name	the group to add the settings to in `key_file`, or null to use the default name “Page Setup”