Open a long conversation at its end, load earlier messages on scroll - #38
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Piggidragon wants to merge 5 commits into
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Piggidragon wants to merge 5 commits into
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Conversation
The chat scrolled to the end on every new event, and the agent's terminal output did the same, so scrolling back to read during a run was undone by the next line. The chat's jump was also smooth, which fought the scroll. Both now follow new output only while you are at the end, and leave you where you scrolled otherwise; scrolling back down to the end resumes following. Something you send, and a conversation's first paint, still go to the end. The jump is instant. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Opening one drew the whole replay event by event: the view started at the top, built downwards over a second or more and then jumped to the end, and each event also asked for a fresh session list. - The replay is gathered and applied once it has caught up. Until then the chat says it is loading; one status update and one list refresh follow instead of one per event. - Only the last 40 messages are drawn. Earlier ones are added as the top edge comes within 600px, from what is already held first and then from the server, so no button is needed. The view is kept on the message being read while they are added and while their height settles. - Positioning at the end happens before the first paint. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
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📝 WalkthroughWalkthroughThe change batches session replay events before rendering, adds loading state to Chat, paginates older transcript messages, and centralizes conditional scroll-following for Chat and VoiceTerminal. ChangesConversation UI
Priority: ⬇️ Low Estimated code review effort: 3 (Moderate) | ~30 minutes Change: Feature Sequence Diagram(s)sequenceDiagram
participant EventSource
participant Shell
participant Chat
EventSource->>Shell: deliver replay events
Shell->>Shell: buffer and flush replay batch
Shell->>Chat: pass loaded state and events
Chat->>Chat: render conversation
Suggested reviewers: Merge Risk: 🟡 Moderate · up to Live updates can make the message being read disappear, and replay transitions can briefly show partial or previous-session content. These issues should be fixed before merge. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
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The follow-the-end scroll ran in useEffect, so updated content could be painted at the old scroll offset for a frame before it reached the end. Both callers (the chat and the agent terminal) now use useLayoutEffect. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
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Inline comments:
In `@web/src/App.tsx`:
- Line 92: Update Shell’s session replay state to track the loaded session ID,
clearing it when replay starts and setting it to sessionId after catch-up. In
the Chat props, derive replayReady by comparing loadedSessionId with active.id,
and pass empty events plus loading=true until they match so previous session
events cannot render for the new session.
In `@web/src/components/Chat.tsx`:
- Around line 430-443: Update the Chat rendering flow around the loading status,
visible.map, and ActivityLine so the loading status is shown whenever loading is
true, regardless of item count. Render visible transcript items and ActivityLine
only when loading is false, keeping the existing empty-state behavior for
completed conversations with no items.
- Around line 171-173: The visible slice in Chat should preserve the current
reading window when new items are appended while the user is not following the
end. Update the state/effect around shown and useFollowBottom so shown increases
by the number of appended items when not following the end, while retaining the
fixed PAGE-based tail window only when following the end.
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web/src/App.tsxweb/src/components/Chat.tsxweb/src/components/VoiceTerminal.tsxweb/src/use-follow-bottom.ts
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Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com> # Conflicts: # web/src/components/Chat.tsx
… load - Track which session's replay has arrived instead of a flag, and hand Chat no events until it has, so the first render after switching never shows the previous session's messages under the new title. - Reading above the end, appended items grow the drawn window instead of pushing the oldest drawn message out of it. At the end it still slides. - While loading, Chat draws no transcript and no activity line, and says so whether or not partial events are held. - Stop clearing the last-said marker when the session id effect first runs. It made the first update after opening look like a message just sent and pulled the view to the end from wherever it was being read. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
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What
Opening a long conversation no longer starts at the top, builds downwards and then jumps to the end. It opens at the end, and earlier messages are loaded as you scroll up towards them.
Builds on #37 (the follow-the-end logic): this branch contains its commit until that is merged.
Why it was slow
The replay of the last 1200 events was applied one event at a time. Each event re-rendered the whole conversation and every
portal_statusin it triggered a session-list refresh, so a long conversation drew itself over a second or more and the view ended up wherever the growing list had left it.Changes
App.tsx: events arriving beforecaught-upare gathered and applied in onesetEvents; only the lastportal_statusin the batch updates the status/list, and dialog events are still applied in order. Aloadedflag is passed toChatasloading. If the connection drops mid-replay what arrived is kept, since the resume cursor has already moved past it.Chat.tsx:PAGE). AnIntersectionObserveron the top edge (600 px margin) adds 40 more each time, from what is already held and then, when that runs out, from the server (onLoadEarlier). The "Load earlier" button stays as a fallback, shown only when nothing is left to reveal locally.Measured
Real Chrome, a synthetic session of 6400 events (400 turns, 8.4 MB; 1200 replayed), two runs each:
Scrolling up to the first message took 42 additions including the server pages; the message being read moved at most 1 px each time. An empty session still shows its prompt.
Not tried: touch scrolling, voice mode, the loading text on screen (the replay is too quick to catch it here), or a slower machine.
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