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perf(chat): hold the previous timeline while a session loads; fade only when waited

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- ChatContainer swaps the timeline on a deferred copy of the selection so the
  active row, URL, and tab commit first. (This part had been overwritten by a
  concurrent edit before the previous commit and is restored here.)
- A session whose messages are not in memory keeps the previous conversation
  on screen for up to 400ms while they load, instead of flashing a skeleton
  between two conversations.
- The reveal fade runs only for a session the user waited for and is 100ms;
  a session that was ready at the click appears in the same frame.
- The sidebar prefetches the two rows on either side of the open session
  150ms after it settles, two at a time, so neighbouring switches are warm.
This commit is contained in:
Bohdan Triapitsyn
2026-08-29 17:22:31 +03:00
parent 115138f5a3
commit c2136ce838
4 changed files with 82 additions and 17 deletions
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packages/ui/src/components/session/sidebar/list/useSessionPrefetch.ts
+8 -7
View File
@@ -5,9 +5,12 @@ import { getSyncSessionMaterializationStatus } from '@/sync/sync-refs';
import { isVSCodeRuntime } from '@/lib/desktop';
const SESSION_PREFETCH_HOVER_DELAY_MS = 180;
const SESSION_PREFETCH_SETTLE_MS = 600;
const SESSION_PREFETCH_CONCURRENCY = 1;
const SESSION_PREFETCH_PENDING_LIMIT = 6;
const SESSION_PREFETCH_SETTLE_MS = 150;
const SESSION_PREFETCH_CONCURRENCY = 2;
const SESSION_PREFETCH_PENDING_LIMIT = 8;
// Nearest first: the rows right next to the open session are the likeliest
// next click.
const NEIGHBOR_PREFETCH_OFFSETS = [-1, 1, -2, 2];
type Args = {
enabled?: boolean;
@@ -132,8 +135,7 @@ export const useSessionPrefetch = ({ enabled = true, currentSessionId, sortedSes
const timer = window.setTimeout(() => {
const currentIndex = sortedSessions.findIndex((session) => session.id === currentSessionId);
if (currentIndex < 0) return;
scheduleSessionPrefetch(sortedSessions[currentIndex - 1]);
scheduleSessionPrefetch(sortedSessions[currentIndex + 1]);
for (const offset of NEIGHBOR_PREFETCH_OFFSETS) scheduleSessionPrefetch(sortedSessions[currentIndex + offset]);
}, SESSION_PREFETCH_SETTLE_MS);
return () => window.clearTimeout(timer);
}, [currentSessionId, enabled, prefetchDisabled, scheduleSessionPrefetch, sortedSessions]);
@@ -145,8 +147,7 @@ export const useSessionPrefetch = ({ enabled = true, currentSessionId, sortedSes
const timer = window.setTimeout(() => {
const currentIndex = recentSessions.findIndex((session) => session.id === currentSessionId);
if (currentIndex < 0) return;
scheduleSessionPrefetch(recentSessions[currentIndex - 1]);
scheduleSessionPrefetch(recentSessions[currentIndex + 1]);
for (const offset of NEIGHBOR_PREFETCH_OFFSETS) scheduleSessionPrefetch(recentSessions[currentIndex + offset]);
}, SESSION_PREFETCH_SETTLE_MS);
return () => window.clearTimeout(timer);
}, [currentSessionId, enabled, prefetchDisabled, recentSessions, scheduleSessionPrefetch]);