Input.valid_empty incorrectly ignored #5917
Description
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!