Iced 0.12.1 issue with Undoable widget

Cargo.toml

[package]
name = "iced-undoable"
version = "0.1.0"
edition = "2021"

# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html

[dependencies]
iced = { version = "0.12.1", features = ["advanced"] }

main.rs

mod undoable;

use iced::widget::{column, text_input};
use iced::{Alignment, Element, Sandbox, Settings};

use undoable::{Action, Undoable};

pub fn main() -> iced::Result {
    Counter::run(Settings::default())
}

struct Counter {
    history: Vec<String>,
    index: usize,
}

#[derive(Debug, Clone)]
enum Message {
    Input(String),
    Revert(Action),
}

impl Sandbox for Counter {
    type Message = Message;

    fn new() -> Self {
        Self {
            history: vec!["!".to_string()],
            index: 0,
        }
    }

    fn title(&self) -> String {
        String::from("Repro")
    }

    fn update(&mut self, message: Message) {
        println!("Message: {:?}", &message);
        match message {
            Message::Input(text) => {
                self.history.truncate(self.index + 1);
                self.history.push(text);
                self.index = self.history.len() - 1;
            }
            Message::Revert(action) => {
                match action {
                    Action::Undo => {
                        self.index = self.index.saturating_sub(1);
                    }
                    Action::Redo => {
                        self.index = (self.index + 1).min(self.history.len().saturating_sub(1));
                    }
                }
            }
        }
        println!("New text: {}", &self.history[self.index]);
    }

    fn view(&self) -> Element<Message> {
        column![
            Undoable::new(
                text_input("", &self.history[self.index]).on_input(Message::Input),
                Message::Revert,
            )
        ]
        .padding(20)
        .align_items(Alignment::Center)
        .into()
    }
}

undoable.rs

use iced::{
    advanced::{
        layout, renderer,
        widget::{Operation, Tree},
        Clipboard, Layout, Shell, Widget,
    },
    event::{self, Event},
    keyboard::Key,
    mouse, overlay, Element, Length, Rectangle,
};

#[derive(Clone, Copy, Debug, PartialEq, Eq)]
pub enum Action {
    Undo,
    Redo,
}

#[allow(missing_debug_implementations)]
pub struct Undoable<'a, Message, Theme, Renderer, F>
where
    Message: Clone,
    F: Fn(Action) -> Message + 'a,
{
    content: Element<'a, Message, Theme, Renderer>,
    on_change: F,
}

impl<'a, Message, Theme, Renderer, F> Undoable<'a, Message, Theme, Renderer, F>
where
    Message: Clone,
    F: Fn(Action) -> Message + 'a,
{
    pub fn new<T>(content: T, on_change: F) -> Self
    where
        T: Into<Element<'a, Message, Theme, Renderer>>,
    {
        Self {
            content: content.into(),
            on_change,
        }
    }
}

impl<'a, Message, Theme, Renderer, F> Widget<Message, Theme, Renderer> for Undoable<'a, Message, Theme, Renderer, F>
where
    Message: Clone,
    Renderer: iced::advanced::text::Renderer,
    F: Fn(Action) -> Message + 'a,
{
    fn children(&self) -> Vec<Tree> {
        vec![Tree::new(&self.content)]
    }

    fn diff(&self, tree: &mut Tree) {
        tree.diff_children(std::slice::from_ref(&self.content))
    }

    fn size(&self) -> iced::Size<Length> {
        self.content.as_widget().size()
    }

    fn size_hint(&self) -> iced::Size<Length> {
        self.content.as_widget().size_hint()
    }

    fn state(&self) -> iced::advanced::widget::tree::State {
        self.content.as_widget().state()
    }

    fn tag(&self) -> iced::advanced::widget::tree::Tag {
        self.content.as_widget().tag()
    }

    fn layout(
            &self,
            tree: &mut Tree,
            renderer: &Renderer,
            limits: &layout::Limits,
    ) -> layout::Node {
        self.content.as_widget().layout(tree, renderer, limits)
    }

    fn operate(
        &self,
        tree: &mut Tree,
        layout: Layout<'_>,
        renderer: &Renderer,
        operation: &mut dyn Operation<Message>,
    ) {
        self.content
            .as_widget()
            .operate(&mut tree.children[0], layout, renderer, operation)
    }

    fn on_event(
        &mut self,
        tree: &mut Tree,
        event: Event,
        layout: Layout<'_>,
        cursor: mouse::Cursor,
        renderer: &Renderer,
        clipboard: &mut dyn Clipboard,
        shell: &mut Shell<'_, Message>,
        viewport: &Rectangle,
    ) -> event::Status {
        if let Event::Keyboard(iced::keyboard::Event::KeyPressed { key, modifiers, ..  }) = &event {
            let focused = tree.children[0]
                .state
                .downcast_ref::<iced::widget::text_input::State::<Renderer::Paragraph>>()
                .is_focused();
            if focused {
                match (key.as_ref(), modifiers.command(), modifiers.shift()) {
                    (Key::Character("z"), true, false) => {
                        shell.publish((self.on_change)(Action::Undo));
                        return event::Status::Captured;
                    }
                    (Key::Character("y"), true, false) | (Key::Character("z"), true, true) => {
                        shell.publish((self.on_change)(Action::Redo));
                        return event::Status::Captured;
                    }
                    _ => (),
                };
            }
        }

        self.content.as_widget_mut().on_event(
            &mut tree.children[0],
            event,
            layout,
            cursor,
            renderer,
            clipboard,
            shell,
            viewport,
        )
    }

    fn mouse_interaction(
        &self,
        tree: &Tree,
        layout: Layout<'_>,
        cursor_position: mouse::Cursor,
        viewport: &Rectangle,
        renderer: &Renderer,
    ) -> mouse::Interaction {
        self.content
            .as_widget()
            .mouse_interaction(&tree.children[0], layout, cursor_position, viewport, renderer)
    }

    fn draw(
        &self,
        tree: &Tree,
        renderer: &mut Renderer,
        theme: &Theme,
        style: &renderer::Style,
        layout: Layout<'_>,
        cursor: mouse::Cursor,
        viewport: &Rectangle,
    ) {
        self.content
            .as_widget()
            .draw(&tree.children[0], renderer, theme, style, layout, cursor, viewport)
    }

    fn overlay<'b>(
        &'b mut self,
        tree: &'b mut Tree,
        layout: Layout<'_>,
        renderer: &Renderer,
        translation: iced::Vector,
    ) -> Option<overlay::Element<'b, Message, Theme, Renderer>> {
        self.content
            .as_widget_mut()
            .overlay(&mut tree.children[0], layout, renderer, translation)
    }
}

impl<'a, Message, Theme, Renderer, F> From<Undoable<'a, Message, Theme, Renderer, F>> for Element<'a, Message, Theme, Renderer>
where
    Message: 'a + Clone,
    Theme: 'a,
    Renderer: iced::advanced::text::Renderer + 'a,
    F: Fn(Action) -> Message + 'a,
{
    fn from(undoable: Undoable<'a, Message, Theme, Renderer, F>) -> Self {
        Self::new(undoable)
    }
}