Associates a new value with @key under @group_name.
If @key cannot be found then it is created. If @group_name cannot
be found then it is created. To set an UTF-8 string which may contain
characters that need escaping (such as newlines or spaces), use
g_key_file_set_string().
Associates a new value with @key under @group_name.
If @key cannot be found then it is created. If @group_name cannot be found then it is created. To set an UTF-8 string which may contain characters that need escaping (such as newlines or spaces), use g_key_file_set_string().