Support for adw::PreferencesPage

[chriskilding]

When I try to enclose one or more adw::PreferencesGroups inside an adw::PreferencesPage, I get the following error:

the method `container_add` exists for struct `PreferencesPage`, but its trait bounds were not satisfied

    adw::PreferencesGroup {

/Users/<me>/.cargo/registry/src/index.crates.io-6f17d22bba15001f/libadwaita-0.6.0/src/auto/preferences_page.rs:14:1
   |
14 | / glib::wrapper! {
15 | |     #[doc(alias = "AdwPreferencesPage")]
16 | |     pub struct PreferencesPage(Object<ffi::AdwPreferencesPage, ffi::AdwPreferencesPageClass>) @extends gtk::Widget, @implements gtk::Accessible, gtk::Buildable, gtk::ConstraintTarget;
17 | |
...  |
20 | |     }
21 | | }
   | |_- doesn't satisfy `PreferencesPage: RelmContainerExt` or `PreferencesPage: RelmSetChildExt`
   |
   = note: the following trait bounds were not satisfied:
           `PreferencesPage: RelmSetChildExt`
           which is required by `PreferencesPage: RelmContainerExt`

Is adw::PreferencesPage supported yet? Or is it missing some impls?

[chriskilding]

Thanks :)