Sets key in settings to value.
It is a programmer error to give a key that isn't contained in the schema for settings or for value to have the incorrect type, per the schema.
If value is floating then this function consumes the reference.
the name of the key to set
a glib.Variant of the correct type
TRUE if setting the key succeeded, FALSE if the key was not writable
2.26
Sets key in settings to value.
It is a programmer error to give a key that isn't contained in the schema for settings or for value to have the incorrect type, per the schema.
If value is floating then this function consumes the reference.