Associates a new string 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.
Unlike glib.key_file.KeyFile.setValue, this function handles characters
that need escaping, such as newlines.
Associates a new string 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. Unlike glib.key_file.KeyFile.setValue, this function handles characters that need escaping, such as newlines.