We were incorrectly leaking the display of this button when the file was
folded in the multibuffer:

| Before | After |
|--------|--------|
| <img width="788" height="400" alt="Screenshot 2026-01-15 at 11  42@2x"
src="https://github.com/user-attachments/assets/2ef9d154-35b5-4788-91c2-0e7a8d45594c"
/> | <img width="788" height="400" alt="Screenshot 2026-01-15 at 11 
41@2x"
src="https://github.com/user-attachments/assets/f4d9416b-9826-4616-8e36-8876ef5e25ec"
/> |

Release Notes:

- N/A