Why the memory is on the increase when I modify the ModelRc for update Slint Ui in Rust?

[Ioridy]

How to modify the ModelRc for update Slint Ui in Rust? I try to update ui by modify the ModelRc in a thread with a timer, but I found the memory always increase when the application running.

I tried to verify in a simplified code, but the problem still persists。

• way1 set with new ModelRc
• way2 set data by row for ModelRc
• way3 set data by row for VecModel
• way4 remove and insert row for VecModel

ps: When I only comment out the set line of code(for ModelRc or VecModel), the memory will remain normal, but UI not update.

Rust code

use std::rc::Rc;
use std::{error::Error, thread};
use std::time::Duration;

use slint::{Model, ModelRc, SharedString, VecModel};

slint::include_modules!();

fn main() -> Result<(), Box<dyn Error>> {
    let ui = AppWindow::new()?;

    ui.on_request_increase_value({
        let ui_handle = ui.as_weak();
        move || {
            let ui = ui_handle.unwrap();
            ui.set_counter(ui.get_counter() + 1);
        }
    });

    let ui_handle = ui.as_weak();
    thread::spawn(move || {
        let mut count = 0;
        let ten_millis = Duration::from_millis(10);
        loop {
            count +=1;
            let _ = ui_handle.upgrade_in_event_loop(move |handle| {
                //way1 set with new ModelRc
                // let mut models:Vec<LabelInfo> = Vec::new();
                // for i in 0..3  {
                //     let name = format!("Lable Test {}: {}", i, count);
                //     let mut label: LabelInfo = LabelInfo::default();
                //     label.name = SharedString::from(name);
                //     models.push(label);
                // }

                // let the_model : Rc<VecModel<LabelInfo>> = Rc::new(VecModel::from(models));
                // let the_model_rc = ModelRc::from(the_model.clone());
                // handle.set_labels(the_model_rc);


                //way2 set data by row for ModelRc
                // let ui_labels_rc = handle.get_labels();
                // for row in 0..ui_labels_rc.row_count() {
                //     let mut label = ui_labels_rc.row_data(row).unwrap();
                //     let name = "Lable Test One:".to_string() + &count.to_string();
                //     label.name = SharedString::from(name);

                //     // ui_labels_rc.set_row_data(row, label);
                // }
                
                //way3 set data by row for VecModel<LabelInfo>
                // let ui_labels_rc = handle.get_labels();
                // let the_model = ui_labels_rc.as_any().downcast_ref::<VecModel<LabelInfo>>().expect("We know we set a VecModel earlier");
                // for row in 0..the_model.row_count() {
                //     let mut label = ui_labels_rc.row_data(row).unwrap();
                //     let name = "Lable Test One:".to_string() + &count.to_string();
                //     label.name = SharedString::from(name);

                //     the_model.set_row_data(row, label);
                // }

                //way4 remove and insert row for VecModel<LabelInfo>
                let ui_labels_rc = handle.get_labels();
                let the_model = ui_labels_rc.as_any().downcast_ref::<VecModel<LabelInfo>>().expect("We know we set a VecModel earlier");
                for row in 0..the_model.row_count() {
                    let mut label = ui_labels_rc.row_data(row).unwrap();
                    let name = "Lable Test One:".to_string() + &count.to_string();
                    label.name = SharedString::from(name);

                    the_model.remove(row);
                    the_model.insert(row, label);
                }
            });
            thread::sleep(ten_millis);
        }
    });

    ui.run()?;

    Ok(())
}

Slint code

import { Button, VerticalBox } from "std-widgets.slint";

export struct LabelInfo {
  name: string,
} 

export component AppWindow inherits Window {
    in-out property <int> counter: 42;
    // in-out property <[LabelInfo]> labels;
    in-out property <[LabelInfo]> labels:[
        {
            name: "Test1",
        },
        {
            name: "Test2",
        }
    ];

    callback request-increase-value();
    VerticalBox {
        Text {
            text: "Counter: \{root.counter}";
        }

        Button {
            text: "Increase value";
            clicked => {
                root.request-increase-value();
            }
        }

        for m in root.labels: Rectangle {
            Text {
                text: m.name;
            }
        }
    }
}

[Ioridy]

It's a long time to feedback the question. I found the reason is that the Font Cache, but change to use skia is OK.