Getting auto-height of ShortcutsSection working when creating a ShortcutsWindow programmically

[mipmip (Pim Snel)]

When I to create a help overlay programmatically auto-height is ignored. All shortcuts are listen in one column. I have this sample code:

use gtk::prelude::*;
use gtk::{ApplicationWindow, Button, ShortcutsWindow};

const GENERAL_SHORTCUTS: [(&str, &str); 3] = [
    ("Open Command Pallette", "<Primary><Shift>P"),
    ("Quit", "<Primary>Q"),
    ("Re-execute Last Script", "<Primary><Shift>B"),
];

const EDITOR_SHORTCUTS: [(&str, &str); 12] = [
    ("Undo", "<Primary>Z"),
    ("Redo", "<Primary><Shift>Z"),
    ("Move line up", "<Alt>Up"),
    ("Move line down", "<Alt>Down"),
    ("Move cursor backwards one word", "<Primary>Left"),
    ("Move cursor forward one word", "<Primary>Right"),
    ("Move cursor to beginning of previous line", "<Primary>Up"),
    ("Move cursor to end of next line", "<Primary>Down"),
    ("Move cursor to beginning of line", "<Primary>Page_Up"),
    ("Move cursor to end of line", "<Primary>Page_Down"),
    ("Move cursor to beginning of document", "<Primary>Home"),
    ("Move cursor to end of document", "<Primary>End"),
];

const APP_ID: &str = "org.gtk_rs.HelloWorld2";

fn main() {
    let app = adw::Application::builder().application_id(APP_ID).build();
    app.connect_activate(build_ui);
    app.run();
}

fn build_ui(app: &adw::Application) {
    let window = ApplicationWindow::builder()
        .application(app)
        .title("My GTK App")
        .build();

    window.present();

    let shortcutswindow = gtk::builders::ShortcutsWindowBuilder::new().modal(true).build();

    let general_group = gtk::builders::ShortcutsGroupBuilder::new().title("General").build();
    for (title, accelerator) in GENERAL_SHORTCUTS.iter() {
        general_group.append(
            &gtk::builders::ShortcutsShortcutBuilder::new()
            .title(title)
            .accelerator(accelerator)
            .visible(true)
            .build(),
            );
    }
    let editors_group = gtk::builders::ShortcutsGroupBuilder::new().title("Editor").build();
    for (title, accelerator) in EDITOR_SHORTCUTS.iter() {
        editors_group.append(
            &gtk::builders::ShortcutsShortcutBuilder::new()
            .title(title)
            .accelerator(accelerator)
            .visible(true)
            .build(),
            );
    }
    let section = gtk::builders::ShortcutsSectionBuilder::new().max_height(6).section_name("section1").title("section1").build();

    section.append(&general_group);
    section.append(&editors_group);
    shortcutswindow.set_child(Some(&section));
    shortcutswindow.present();

}

How can I make ShortcutsSection distribute the shortcuts over multiple columns?