why my lineedit losses the focus

[Assassintears]

I'm a fresh man to use rust and slint. My code like this:

slint:

import { Button, VerticalBox, HorizontalBox , LineEdit, TextEdit, GroupBox} from "std-widgets.slint";

export component AppWindow inherits Window {
    preferred-width: 800px;
    preferred-height: 600px;
    title: "TCP Client";
    out property <string> IP;
    out property <string> Port;
    property <string> msg;
    callback signal_connect();

    VerticalBox {
        HorizontalBox {
            Button {
                text: "IP";
            }
            line_ip:= LineEdit {
                font-size: 14px;
                placeholder-text: "Enter IP address";
                text <=> IP;
             }
             Button {
                text: "Port";
            }
            line_port := LineEdit {
                font-size: 14px;
                placeholder-text: "Enter port number";
                text <=> Port;
            }
        }

        HorizontalBox {
            Button {
                text: "Connect";
                clicked => {
                    if (IP == "" || Port == "") {
                        msg = "Please input IP and Port";
                    } else {
                        msg = IP + ":" + Port;
                    }
                    line_recv.text += msg + "\n";
                    }
            }
            Button {
                text: "Disconnect";
            }
        }

        GroupBox { 
            title: "Recv Messages";
            HorizontalBox {
                line_recv := TextEdit {
                    font-size: 14px;
                 }
                 Button {
                    text: "Clear";
                    clicked => {
                        line_recv.text = "";
                    }
                 }
            }
         }

         GroupBox {
             title: "Send Messages";
             HorizontalBox {
                TextEdit { 
                    font-size: 14px;
                 }
                 Button {
                    text: "Send";
                 }
             }
         }
    } 
}

main.rs:

slint::include_modules!();
// use slint::SharedString;
pub mod client;
use client::tcp_client;

fn main() -> Result<(), slint::PlatformError> {
    let ui = AppWindow::new()?;

    ui.on_signal_connect({
        let ui_handle = ui.as_weak();
        move || {
            let ui = ui_handle.unwrap();
            let ip = ui.get_IP();
            let port = ui.get_Port();
        }
    });
    ui.run()
}

[Assassintears]

if I clicked show preview like bellow, it works well.

Well, if I run the code with cargo run, the mainwindow will dosnt work, the textedit widget will not be selected, and the button will not be clicked.

[Assassintears]

Well, It's not a problem, when I start the app, it works well after some seconds

[ogoffart]

Not sure I understand the issue. Is it that just that the window don't refresh (nothing changes)

What happens if you resize the window?
May be related to #5089 and #5206

What would happen if you put a Spinner {indeterminate: true;} just to have an animation?