fix(threads): avoid quadratic overlap check during resume hydration#586
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mhulden wants to merge 1 commit intoDimillian:mainfrom
Open
fix(threads): avoid quadratic overlap check during resume hydration#586mhulden wants to merge 1 commit intoDimillian:mainfrom
mhulden wants to merge 1 commit intoDimillian:mainfrom
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Summary
Long thread resume could become very slow because overlap detection in resume hydration used nested scans:
items.some(...)+localItems.some(...)(quadratic in combined list size)This change replaces that with a
Setof local item IDs and O(1) membership checks.What changed
buildResumeHydrationPlan(src/features/threads/utils/threadActionHelpers.ts):localItemIds = new Set(localItems.map(item => item.id))items.some(item => localItemIds.has(item.id))Why
For long threads, this removes a hot O(n²) path during resume while keeping behavior identical.
Validation
npm run -s typechecknpm run -s test -- src/features/threads/hooks/useThreadActions.test.tsx src/features/threads/hooks/useThreads.integration.test.tsx src/features/app/hooks/useRemoteThreadRefreshOnFocus.test.tsx src/utils/threadItems.test.tsaarch64AppImage locally.