The property is a [struct@GLib.
Variant] property to specify where and what kind of white spaces to draw.
The [[email protected]] is of type `"au"`, an array of unsigned integers. Each integer is a combination of [flags@SpaceTypeFlags]. There is one integer for each [flags@SpaceLocationFlags], in the same order as they are defined in the enum ( gtk_source_space_location_none and gtk_source_space_location_all are not taken into account).
If the array is shorter than the number of locations, then the value for the missing locations will be gtk_source_space_type_none.
By default, gtk_source_space_type_all is set for all locations.4