Gets the known strictness of filters.
If the strictness is not known, gtk.types.FilterMatch.Some is returned.
This value may change after emission of the gtk.filter.Filter.changed signal.
This function is meant purely for optimization purposes, filters can choose to omit implementing it, but gtk.filter_list_model.FilterListModel uses it.
the strictness of self
Gets the known strictness of filters.
If the strictness is not known, gtk.types.FilterMatch.Some is returned.
This value may change after emission of the gtk.filter.Filter.changed signal.
This function is meant purely for optimization purposes, filters can choose to omit implementing it, but gtk.filter_list_model.FilterListModel uses it.