N999 continues to complain about capital letters in old module name even after module is renamed to lowercase

[cwilson-mdmi]

When a module is named something like "TEST.py", Ruff shows the error: Invalid module name: 'TEST' Ruff N999. But when I rename it to "test.py", Ruff continues to show the same error message, still with the previous module name:

This is on Windows 11.

I've tried restarting the Ruff server, reloading/restarting VS Code, renaming to an intermediate file name first, and clearing my venv's cache. None had any effect.

I eventually resolved the issue for myself by deleting my project folder when my working directory was clean and re-cloning the repo.

[cwilson-mdmi]

Possibly related to #574

[ntBre]

Thanks for the report! And good find with #574, this does sound somewhat related. Are you by chance renaming the file in the VS Code interface? I wonder if that preserves the document URI. I'd be curious if renaming outside VS Code helped.

I found a couple of related VS Code issues:

• Changing the case of a file then reloading VS Code provides the old casing in the API microsoft/vscode#121106
• Incorrect URI casing passed to extensions on Windows after file rename microsoft/vscode#137256

But @MichaReiser might know better if there's something more we can do on our end.

I reproduced the diagnostic like this on Linux, but renaming the file works fine there.

mkdir app
touch app/__init__.py app/TEST.py
echo 'lint.select = ["N999"]' > ruff.toml
ruff check

N999 Invalid module name: 'TEST'
--> app/TEST.py:1:1

Found 1 error.

[MichaReiser]

I've tried restarting the Ruff server, reloading/restarting VS Code, renaming to an intermediate file name first, and clearing my venv's cache. None had any effect.

Restarting VS Code should normally be sufficient because Ruff doesn't persist any data between runs in VS Code.

If you encounter this again. Could you try if running ruff check also reports the same error?