VirtualList: multiple items are selected at the same time when inserting new elements

[dajoha]

With VirtualList, when adding new elements in the middle of the source list, 2 (or more) items can be selected at the same time, like if they were considered as the same item:

Can be reproduced with this code:

use floem::{
    reactive::create_signal,
    view::View,
    views::{h_stack, label, scroll, Decorators, VirtualDirection, VirtualItemSize},
    widgets::{button, virtual_list},
};

fn app_view() -> impl View {
    let long_list: im::Vector<i32> = [10, 50, 200].into_iter().collect();
    let (long_list, set_long_list) = create_signal(long_list);

    h_stack((
        button(|| "Update").on_click_stop(move |_| {
            set_long_list.set([10, 20, 50, 200].into_iter().collect());
        }),
        button(|| "Update2").on_click_stop(move |_| {
            set_long_list.set([10, 20, 35, 50, 200].into_iter().collect());
        }),
        scroll(
            virtual_list(
                VirtualDirection::Vertical,
                VirtualItemSize::Fixed(Box::new(|| 20.0)),
                move || long_list.get(),
                move |item| *item,
                move |item| label(move || item.to_string()).style(|s| s.height(20.0)),
            )
            .style(|s| s.flex_col().width_full()),
        )
        .style(|s| s.width(100.0).height_full().border(1.0)),
    ))
    .style(|s| s
        .size_full()
        .padding_vert(20.0)
        .flex_col()
        .items_center()
    )
}

fn main() {
    floem::launch(app_view);
}

Then:

1. First click on button "Update", which creates the bug => items "20" and "50" are selected together.
2. Click on button "Update2" => items "20" and "50" are still selected together, even when separated by other items.