pub trait FilterExt: IsA<Filter> + Sealed + 'static {
// Provided methods
fn changed(&self, change: FilterChange) { ... }
fn strictness(&self) -> FilterMatch { ... }
fn match_(&self, item: &impl IsA<Object>) -> bool { ... }
fn connect_changed<F: Fn(&Self, FilterChange) + 'static>(
&self,
f: F
) -> SignalHandlerId { ... }
}