fix: scroll the selected item into view by value, not stale aria-selected (#389)

[thatssoheil]

Problem

Changing the search in <Command> can scroll the list to the previously-selected item instead of the new first result (#389). It's most visible when a search broadens and the top result changes.

Root cause

scrollSelectedIntoView finds its target via [aria-selected="true"]. cmdk's scheduler (useScheduleLayoutEffect) runs all scheduled callbacks in a single layout-effect pass, so on a search change the scroll fires in the same pass as selectFirstItem — before React commits the re-render that moves aria-selected onto the newly-selected item. The scroll therefore reads the stale attribute and scrolls to the old selection.

The element for the new selection is already in the DOM (it matched the search); only its aria-selected lags by one commit. Its data-value is already correct.

Fix

Resolve the scroll target from state.current.value (the source of truth) by matching data-value, rather than the lagging aria-selected. Scoped to the scroll path, so getSelectedItem() and its other callers are untouched. Comparing data-value in JS (instead of building a selector) also sidesteps escaping arbitrary values into querySelector (cf. #387).

Test

Adds a Playwright regression (test/scroll.test.ts + test/pages/scroll.tsx): narrow the search to an item far down the list, broaden it, and assert the list scrolls back to the new top selection. Fails on main (scrollTop parks at the stale item), passes with this change.

Notes

• Keyboard nav shares the same latent lag, but it's invisible there since neighbours are adjacent — left out of scope to keep the diff tight.
• Touches the same function as fix: guard scrollSelectedIntoView against viewport scroll #408 (the Off-screen <Command /> mount can scroll the window unexpectedly #405 viewport guard); should rebase cleanly.
• Verified locally: pnpm test:format and pnpm build pass. My environment can't run Playwright browsers, so I'm relying on CI for the browser run.

Fixes #389

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_{Implemented with AI assistance (Claude), reviewed and verified by me before submitting.}

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