hdy_combo_row_bind_model() is not bindable
void hdy_combo_row_bind_model (HdyComboRow *self,
GListModel *model,
GtkListBoxCreateWidgetFunc create_list_widget_func,
GtkListBoxCreateWidgetFunc create_current_widget_func,
gpointer user_data,
GDestroyNotify user_data_free_func);
2 callbacks in a row, only one user data/destroy notify. For bindings we should likely have a version with GClosure
and a skip/rename-to dance.