[autocomplete][combobox] Virtualize demo reset carret

[oliviertassinari]

Reproducible example

1. Open https://master--base-ui.netlify.app/react/components/autocomplete#virtualized
   or open https://master--base-ui.netlify.app/react/components/combobox#virtualized

Current behavior

Carret moves

Screen.Recording.2025-09-29.at.15.48.39.mov

Expected behavior

• Input is untouched

Base UI version

v1.0.0-beta.3

[atomiks]

Already fixed by #2707

[oliviertassinari]

Ah sorry, I didn't properly reproduce it. I didn't truly test in master.

[oliviertassinari]

Duplicate of #2703