FilePicker with ref error

[BrentHuang]

Description

Code example to reproduce the issue:

import flet as ft

file_picker = ft.Ref[ft.FilePicker]()


def main(page: ft.Page):

    def pick_files_result(e: ft.FilePickerResultEvent):
        selected_files.value = (", ".join(map(lambda f: f.name, e.files)) if e.files else "Cancelled!")
        selected_files.update()

    pick_files_dialog = ft.FilePicker(on_result=pick_files_result, ref=file_picker)
    selected_files = ft.Text()

    page.overlay.append(pick_files_dialog)

    page.add(
        ft.Row([
            ft.ElevatedButton(
                "Pick files",
                icon=ft.icons.UPLOAD_FILE,
                on_click=lambda _: pick_files_dialog.pick_files(allow_multiple=True),
            ),
            selected_files,
        ]))


ft.app(target=main)

Describe the results you received:

run with 'flet run ./demo.py', the result is:

the callback pick_files_result not entered.

Describe the results you expected:

Additional information you deem important (e.g. issue happens only occasionally):

Flet version (pip show flet):

0.22.0

Give your requirements.txt file (don't pip freeze, instead give direct packages):

no

Operating system:

Linux Mint 21.3 Virginia \n \l

Additional environment details:

[BrentHuang]

on windows and macos, it runs ok.
on linux, I have already installed zenity.

[ndonkoHenri]

What do you mean by "ref error" in the issue title?

[BrentHuang]

What do you mean by "ref error" in the issue title?

[ndonkoHenri]

Yep, I mean, what's the error with them?

[BrentHuang]

the rusult is the loop picture:

not ‘pick_files_result’ callback

[BrentHuang]

if you have a linux environment, you can try my code and click the button. This problem is inevitable.

[lekshmanmj]

I tried your code in web mode... I didn't face issue.

I've a question... Are you able to run app in desktop mode using flet run command ?

[BrentHuang]

yes, I run app in desktop mode using flet run command. my problem (the demo code) is desktop app on LinuxMint.

I tried your code in web mode... I didn't face issue.

I've a question... Are you able to run app in desktop mode using flet run command ?