[autocomplete] popup with transition flickers on input clear when searching for a non existent item

[michaelhazan]

Bug report

Current behavior

Currently, when building an autocomplete with a transition provided to the popup, like the example below, the popup component flickers whenever you search for a non-existent item and then clear the input.

Expected behavior

When the autocomplete input is cleared while searching for a non-existent item, the popup should close, and the list content shouldn't change during the closing transition timeframe.

Reproducible example

try searching for z and then deleting it:
https://stackblitz.com/edit/vu1nb1hw?file=src%2FApp.tsx

Base UI version

v1.3.0

Which browser are you using?

Firefox

Which OS are you using?

Mac OS

[linear]

BAS-482

[atomiks]

Combobox happens to avoid this due to 1) keeping the popup open when clearing the input (by default), and 2) stabilizing the filter order while exiting.

Though in general I'm skeptical about autocompletes having an exit animation — none of the ones I see on the web have one, possibly to avoid filter flickers like this without complex logic