`Input.valid_empty` incorrectly ignored

[holdenweb]

Have you checked closed issues? (https://github.com/Textualize/textual/issues?q=is%3Aissue+is%3Aclosed) yes

Have you checked against the most recent version of Textual? (https://pypi.org/search/?q=textual) yes

The bug

Please give a brief but clear explanation of the issue. If you can, include a complete working example that demonstrates the bug. Check it can run without modifications.

The following test, which fails under the current production textual, demonstrates that an Input with valid_empty=False is valid when created with non-empty content, but is not invalidated when the content is deleted.

from textual.app import App, ComposeResult
from textual.widgets import Input
import pytest
import pytest_asyncio

@pytest.mark.asyncio
async def test_invalid_empty():

    class InvalidEmptyApp(App):

        def compose(self) -> ComposeResult:
            yield Input(valid_empty=False, id="test-in", value="x")

    app = InvalidEmptyApp()
    async with app.run_test() as pilot:
        input = app.query_one(Input)

        assert input.has_class('-valid')
        assert not input.has_class('-invalid')

        await pilot.press('backspace')

        assert input.has_class('-invalid')
        assert not input.has_class('-valid')

It will be helpful if you run the following command and paste the results:

textual diagnose

<!-- This is valid Markdown, please paste the following directly in to a GitHub issue -->
# Textual Diagnostics

## Versions

| Name    | Value  |
|---------|--------|
| Textual | 3.5.0  |
| Rich    | 14.0.0 |

## Python

| Name           | Value                                                         |
|----------------|---------------------------------------------------------------|
| Version        | 3.12.8                                                        |
| Implementation | CPython                                                       |
| Compiler       | Clang 19.1.6                                                  |
| Executable     | /Users/sholden/Projects/Python/textual-forms/.venv/bin/python |

## Operating System

| Name    | Value                                                                                                  |
|---------|--------------------------------------------------------------------------------------------------------|
| System  | Darwin                                                                                                 |
| Release | 24.5.0                                                                                                 |
| Version | Darwin Kernel Version 24.5.0: Tue Apr 22 19:48:46 PDT 2025; root:xnu-11417.121.6~2/RELEASE_ARM64_T8103 |

## Terminal

| Name                 | Value              |
|----------------------|--------------------|
| Terminal Application | iTerm.app (3.5.14) |
| TERM                 | rxvt               |
| COLORTERM            | truecolor          |
| FORCE_COLOR          | *Not set*          |
| NO_COLOR             | *Not set*          |

## Rich Console options

| Name           | Value               |
|----------------|---------------------|
| size           | width=80, height=37 |
| legacy_windows | False               |
| min_width      | 1                   |
| max_width      | 80                  |
| is_terminal    | False               |
| encoding       | utf-8               |
| max_height     | 37                  |
| justify        | None                |
| overflow       | None                |
| no_wrap        | False               |
| highlight      | None                |
| markup         | None                |
| height         | None                |

If you don't have the textual command on your path, you may have forgotten to install the textual-dev package.

Feel free to add screenshots and / or videos. These can be very helpful!

[github-actions[bot]]

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This is an automated reply, generated by FAQtory

[TomJGooding]

@holdenweb Following the discussions in #5909, do you think this issue can now be closed or is valid_empty still unclear?