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fix(app): preserve momentum during live session updates

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Track real user scrolling through scrollend with a quiet watchdog, defer timeline commits and virtualizer corrections until settlement, and make SessionDetail the sole tail-follow owner. Add unit and Electron regressions for scroll writes, reader anchoring, near-tail escape, explicit navigation, and flap timing.
This commit is contained in:
tommy0103
2026-07-15 01:35:05 +08:00
parent b58c34d3af
commit 82d9fbf657
10 changed files with 485 additions and 43 deletions
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tests/session-live-reload.test.mjs
+5 -5
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@@ -11,7 +11,7 @@ import {
import { assembleSessionMessages } from '../app/src/shared/session-detail-assembly.mjs';
import { createSessionPatch } from '../app/src/shared/session-patch.mjs';
test('live snapshots coalesce while scrolling and commit once after scroll end', async () => {
test('live snapshots keep loading while scrolling and commit only the latest after scroll end', async () => {
let scrolling = true;
let loads = 0;
const commits = [];
@@ -24,16 +24,16 @@ test('live snapshots coalesce while scrolling and commit once after scroll end',
await coordinator.request();
await coordinator.request();
await coordinator.request();
assert.equal(loads, 0);
assert.equal(loads, 3, 'patches are loaded into the pending snapshot while the timeline is frozen');
assert.deepEqual(commits, []);
scrolling = false;
await coordinator.flush();
assert.equal(loads, 1);
assert.deepEqual(commits, [1]);
assert.equal(loads, 3, 'scroll end reuses the freshest pending snapshot');
assert.deepEqual(commits, [3]);
await coordinator.flush();
assert.equal(loads, 1, 'an idle flush without another update is a no-op');
assert.equal(loads, 3, 'an idle flush without another update is a no-op');
});
test('an update arriving during an in-flight load skips the stale snapshot without overlap', async () => {