https://gitlab.gnome.org/GNOME/libadwaita/-/commit/0509755b80d8
https://gitlab.gnome.org/World/Rust/libadwaita-rs/-/commit/986f12d5170d

$ RUST_BACKTRACE=1 authenticator
(<unknown>:1234): GLib-GObject-WARNING **: specified class size for type 'UrlRow' is smaller than the parent type's 'AdwActionRow' class size
(<unknown>:1234): GLib-GObject-WARNING **: cannot add private field to invalid (non-instantiatable) type '<invalid>'
thread 'main' panicked at 'assertion failed: type_.is_valid()', src/widgets/url_row.rs:17:5
stack backtrace:
   0: rust_begin_unwind
   1: core::panicking::panic_fmt
   2: core::panicking::panic
   3: <authenticator::widgets::url_row::imp::UrlRow as glib::subclass::types::ObjectSubclassType>::get_type
             at src/widgets/url_row.rs:17:5
   4: <authenticator::widgets::url_row::UrlRow as glib::types::StaticType>::static_type
             at src/widgets/url_row.rs:86:1
   5: <gtk4::subclass::widget::TemplateChild<T> as core::default::Default>::default
             at gtk4-rs-13a8317a2ef8738362b9fa7f55a29dd5d3dbc459/gtk4/src/subclass/widget.rs:1124:9
   6: <authenticator::widgets::accounts::details::imp::AccountDetailsPage as glib::subclass::types::ObjectSubclass>::new
             at src/widgets/accounts/details.rs:36:30
   7: glib::subclass::types::ObjectSubclass::with_class
             at gtk3-rs-6e3c8739f9f5b8dc0a234f4a485e254574af5953/glib/src/subclass/types.rs:531:9
   8: glib::subclass::types::instance_init
             at gtk3-rs-6e3c8739f9f5b8dc0a234f4a485e254574af5953/glib/src/subclass/types.rs:722:15
[...]

--- ../libadwaita-rs-6ae4d3670565064acc9da2f51434eca0a0c51ac9/libadwaita/sys/src/lib.rs.orig	2021-03-12 01:18:14 UTC
+++ ../libadwaita-rs-6ae4d3670565064acc9da2f51434eca0a0c51ac9/libadwaita/sys/src/lib.rs
@@ -68,7 +68,7 @@ pub type AdwAvatarImageLoadFunc =
 #[repr(C)]
 #[derive(Copy, Clone)]
 pub struct AdwActionRowClass {
-    pub parent_class: gtk::GtkListBoxRowClass,
+    pub parent_class: AdwPreferencesRowClass,
     pub activate: Option<unsafe extern "C" fn(*mut AdwActionRow)>,
     pub padding: [gpointer; 4],
 }