pub trait EditableImplExt: Sealed + ObjectSubclass {
    // Provided methods
    fn delegate_get_property(
        &self,
        prop_id: usize,
        pspec: &ParamSpec
    ) -> Option<Value> { ... }
    fn delegate_set_property(
        &self,
        prop_id: usize,
        value: &Value,
        pspec: &ParamSpec
    ) -> bool { ... }
    fn parent_insert_text(&self, text: &str, length: i32, position: &mut i32) { ... }
    fn parent_delete_text(&self, start_position: i32, end_position: i32) { ... }
    fn parent_text(&self) -> GString { ... }
    fn parent_delegate(&self) -> Option<Editable> { ... }
    fn parent_changed(&self) { ... }
    fn parent_do_insert_text(&self, text: &str, length: i32, position: &mut i32) { ... }
    fn parent_do_delete_text(&self, start_position: i32, end_position: i32) { ... }
    fn parent_selection_bounds(&self) -> Option<(i32, i32)> { ... }
    fn parent_set_selection_bounds(
        &self,
        start_position: i32,
        end_position: i32
    ) { ... }
}