fix(desktop): keep stream timeline pinned through settle#1320
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When the user jumps to bottom mid-prepend (abandon), the load-older restore loop targeted the last virtualized row's END offset. That sits short of the container's true floor once padding/spacers are excluded, stranding the view above the bottom (the `Received: Infinity` scroll-history failure). Target the container's true floor (scrollHeight - clientHeight) instead. Adds relay-backed stream stability tests covering pin-to-latest, composer growth, and above-the-fold arrivals. Co-authored-by: Brain <21994759fc7a6fa6b965551d35cfd7897d262f2495467f2d78694ddcfa6a5c7e@sprout-oss.stage.blox.sqprod.co> Signed-off-by: Wes <wesbillman@users.noreply.github.com>
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Summary
Why this matters
Recent main/release failures showed
stream.spec.tsintermittently stuck withdistanceFromBottomaround205while the receiver timeline still had the empty/intro content in the scroll container. A sidebar-only PR (#1319) reproduced the same deterministic205, which points at shared timeline infrastructure rather than the app code under test in those PRs.The root cause is the timeline latching an away-from-bottom message anchor from synthetic scroll events emitted during virtualizer settle or burst appends. The user never scrolled, but the app could still show the unread pill and stop chasing the true bottom.
Verification
pnpm --dir desktop checkpnpm --dir desktop build./scripts/start-relay-for-tests.sh --profile ci && ./scripts/setup-desktop-test-data.sh && pnpm --dir desktop exec playwright test --project=integration tests/e2e/stream.spec.ts --repeat-each=3→ 30/30 passedpnpm --dir desktop checkafter final cleanupMasking check:
REVERT_PROOF_TEST_STATUS=1, 2/30 failures)The revert-one failures tripped during seed propagation/visibility rather than the original
205assertion. That is still the same no-user-scroll anchor-latch race surfacing at a different point in the seed burst; the important result is that the helper-only change does not carry the shard green.