bug: TextField native undo (ctrl + z) causes the cursor to jump to the end of the text.

[StianHanssen]

Duplicate Check

• I have searched the opened issues and there are no duplicates

Describe the bug

I wanted to implement undo/redo on a TextField, but I found out that the field natively supports it with ctrl + z and ctrl + shift + z. However, when I do an undo, the cursor tends to jumps to the end of the text, and I can't find a way to prevent it.

Code sample

Code

ft.TextField(
    label="Test",
    multiline=True,
    min_lines=5,
    hint_text="Just trying some text",
    width=700,
    border_color=ft.Colors.GREY_300,
    focused_border_color=ft.Colors.GREY_600,
    expand=True,
)

To reproduce

1. Start up an application with a simple multiple text field, as I provided in the code example.
2. Paste in a few paragraphs of text.
3. Make some edits.
4. Perform ctrl + z
5. At least on Ubuntu, this causes the cursor to jump to the end of the text.

Expected behavior

I expect the cursor to stay at the current location when ctrl + z is pressed.

Screenshots / Videos

Captures

2025-10-29.10-59-05.mp4

Operating System

Linux

Operating system details

Ubuntu 24.04.3 LTS

Flet version

0.28.3

Regression

I'm not sure / I don't know

Suggestions

I am not at all a dart expert, so this could be way off, but I thought it could have something to do with: packages/flet/lib/src/controls/textfield.dart, where we set selection: TextSelection.collapsed(offset: value.length).

Logs

Logs

I just start the python code:

python main.py

Additional details

No response

[FeodorFitsner]

Can you reproduce the issue on Flet v1 (the latest pre-release)?

I'm checking this behavior on macOS with Flet pre-release and it's fine. Could be something in Flutter that was fixed in more recent versions.

[StianHanssen]

Can you reproduce the issue on Flet v1 (the latest pre-release)?

I'm checking this behavior on macOS with Flet pre-release and it's fine. Could be something in Flutter that was fixed in more recent versions.

@FeodorFitsner Hi! How can I access the v1 pre-release? I see some pre-releases on pipy, the latest one being 0.70.0.dev6491, but it is not v1.

[FeodorFitsner]

Like this: https://flet.dev/blog/introducing-flet-1-0-alpha#trying-flet-10-alpha

[StianHanssen]

The bug seems to persist in v1 as well.

2025-10-31.18-50-40.mp4

This is the code:

"""Minimal Flet app with TextField."""

import flet as ft


def main(page: ft.Page) -> None:
    """Main entry point for the application.

    :param page: Flet page instance.
    """
    page.title = "Minimal Test App"
    page.add(
        ft.TextField(
            label="Test",
            multiline=True,
            min_lines=5,
            hint_text="Just trying some text",
            width=700,
            border_color=ft.Colors.GREY_300,
            focused_border_color=ft.Colors.GREY_600,
            expand=True,
        )
    )


if __name__ == "__main__":
    ft.run(main, view=ft.AppView.WEB_BROWSER)

I ran in browser because I had some issues getting it to run with the default view. Maybe some new system dependencies needed or something.

This is my flet doctor output:

✔ Flet Version: 0.70.0.dev6519
✔ Python Version: 3.13.3 (main, Apr  9 2025, 04:03:52) [Clang 20.1.0 ]
✔ Operating System: Linux 6.8.0-87-generic (#88-Ubuntu SMP PREEMPT_DYNAMIC Sat Oct 11 09:28:41 
UTC 2025)

Additional notes:

• I also found that the cursor doesn't move when you hold the arrow buttons, it only moves when you let go. This makes it hard to see where the cursor ends up.