get_strictness

Gets the known strictness of a filter.

If the strictness is not known, [enum@Gtk.FilterMatch.some] is returned.

This value may change after emission of the [signal@Gtk.Filter:GtkFilter:changed] signal.

This function is meant purely for optimization purposes. Filters can choose to omit implementing it, but `GtkFilterListModel` uses it.

Parameters:

this

a filter

Returns:

the strictness of this