Reads the print settings from the group group_name in key_file.
If the file could not be loaded then error is set to either a `GFileError` or `GKeyFileError`.
| this |
a `GtkPrintSettings` |
| key_file |
the `GKeyFile` to retrieve the settings from |
| group_name |
the name of the group to use, or null to use the default “Print Settings” |
|
true on success |