Function updateThreadPreviewState

apps/web/src/previewStateStore.ts:94–108

(
  ref: ScopedThreadRef,
  update: (current: ThreadPreviewState) => ThreadPreviewState,
)

}

function updateThreadPreviewState(
  ref: ScopedThreadRef,
  update: (current: ThreadPreviewState) => ThreadPreviewState,
): void {
  const threadKey = scopedThreadKey(ref);
  const atom = previewStateAtom(threadKey);
  let nextState = appAtomRegistry.get(atom);
  const changed = appAtomRegistry.modify(atom, (current) => {
    nextState = update(current);
    return [nextState !== current, nextState];
  });
  if (!changed) return;
  changedPreviewThreadKeys.add(threadKey);
  syncActivePreviewThread(threadKey, nextState);
}

const dedupeRecentUrls = (existing: string[], url: string): string[] => {
  const next = [url, ...existing.filter((entry) => entry !== url)];