Textual's restyle loop gets overloaded when a `*` selector and `:hover` selector target the same style block

[NSPC911]

The bug

When having an unassuming stylesheet like this

#root > *,
Button:hover {
    border: solid red
}

moving your mouse around can make each restyle take much much longer.

2026-06-26_23-41-53.mp4

Script used: https://github.com/NSPC911/textual-trials/blob/master/lagging-mouse.py

This effect worsens with more style definitions.

[github-actions]

We found the following entries in the FAQ which you may find helpful:

• Does Textual support images?
• How do I center a widget in a screen?

Feel free to close this issue if you found an answer in the FAQ. Otherwise, please give us a little time to review.

This project is developed and maintained by Will McGugan. Consider sponsoring Will's work on this project (and others).

This is an automated reply, generated by FAQtory