perf(app): virtualize session timeline rows#26949
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Pull request overview
This PR improves session timeline render performance in the app by upgrading virtua and switching the session timeline rendering model to virtualize at “timeline row” granularity (user message row, assistant part rows, thinking/retry/error rows, diff summaries, etc.) rather than rendering full turns.
Changes:
- Upgrade
virtuaand refactor the session timeline to produce a flattened list of keyedTimelineRows rendered viaVirtualizer. - Add timeline-part ID data attributes and export part-grouping utilities from
@opencode-ai/ui/message-partto support row-level virtualization and anchoring. - Defer default-open tool body mounting in
BasicToolto reduce first-paint cost.
Reviewed changes
Copilot reviewed 7 out of 8 changed files in this pull request and generated 2 comments.
Show a summary per file
| File | Description |
|---|---|
| packages/ui/src/components/message-part.tsx | Exports part grouping helpers/types and adds timeline-part data attributes used for row virtualization/anchoring. |
| packages/ui/src/components/basic-tool.tsx | Defers mounting heavy tool bodies (including default-open) using a global deferred mount queue. |
| packages/ui/package.json | Exposes ./session-diff as a package export for app-side use. |
| packages/app/src/pages/session/use-session-hash-scroll.ts | Integrates “reveal” hook so hash scrolling can work with virtualization. |
| packages/app/src/pages/session/message-timeline.tsx | Major refactor: builds flattened timeline rows and renders them through virtua Virtualizer, including diff summaries and turn status rows. |
| packages/app/src/pages/session.tsx | Replaces “history window” logic with a history loader that coordinates prepend + virtualization shift, and wires reveal callback into hash scrolling. |
| package.json | Bumps virtua version to 0.49.1. |
| bun.lock | Lockfile update for virtua@0.49.1. |
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| cancelShiftReset() | ||
| setState("shift", true) | ||
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| while (true) { | ||
| await input.loadMore(id) |
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| part={part} | ||
| message={message} | ||
| showAssistantCopyPartID={assistantCopyPartID(row.userMessageID)} | ||
| turnDurationMs={turnDurationMs(row.userMessageID)} | ||
| defaultOpen={partDefaultOpen(part, settings.general.shellToolPartsExpanded(), settings.general.editToolPartsExpanded())} |
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