## Summary
This fixes the Desktop Smoke E2E failure that turned `main` red at
af7979e ([run](https://github.com/block/buzz/actions/runs/39295686771)).
The failing test was `video-attachment.spec.ts` "playback speed persists
across videos and reloads". The cause is a real timeline bug, not a
problem in the test.
When the reader leaves the bottom, `MessageTimeline` freezes the live
tail and sets a one-shot flag. The flag tells it to ignore the next "at
bottom" report, because freezing the tail can shorten Virtua's model and
produce a false one. If nothing is buffered, the freeze doesn't change
the model, so that false report never arrives. The flag then stays set
and swallows the reader's real return to the bottom. If the reader gets
back to the bottom in one scroll event, the tail stays frozen and new
messages wait behind a "1 new message" pill even though the reader is
already at the bottom. A scrollbar jump, the End key, or Playwright's
scroll-into-view retry all return in one event.
In CI, the Play click was intercepted, so Playwright retried it with
different scroll alignments. That moved the timeline away from the
bottom (scrollTop 430 → 289 → 430, seen in the run's trace), and the
second video message was buffered and never rendered.
Fix: once the freeze commits with nothing buffered, clear the flag. If
the reader is already back at the bottom, release the tail.
### Related issue
None found. No open PR touches this.
### Testing
- New smoke test `virtualization.spec.ts` "a single scroll back to the
bottom releases the live tail": failed 10/10 before the fix, passed
10/10 after (`--repeat-each=10`).
- `video-attachment.spec.ts` "playback speed persists…": 20/20 passed
with `--repeat-each=20`.
- Smoke runs of `virtualization`, `scroll-history`, `video-attachment`,
`messaging`, `smoke`, `file-attachment` and `thread-follow`: 188 passed.
3 failed with a blank page before the first click, and all 3 passed on
re-run. Unmodified `main` shows the same failure locally, so it's a
local preview-server flake and unrelated to this change.
- `pnpm typecheck`, `pnpm check`, and `pnpm test` (6829 + 160 tests) all
pass.
Signed-off-by: Fizz <6be7be23ec5bba868f3e1db5ec86013d76bd1a293dce5b435a192158fec13641@buzz.block.builderlab.xyz>
Co-authored-by: Fizz <6be7be23ec5bba868f3e1db5ec86013d76bd1a293dce5b435a192158fec13641@buzz.block.builderlab.xyz>
## Summary
- Makes Projects repository-aware across browsing, branch and tag
selection, local and remote source management, work items, commits, and
contextual repository actions.
- Refines project details into consistent single-column reading surfaces
with a resizable, section-aware context pod, while keeping project
conversations available in the attached chat panel.
- Adds persistent sidebar project navigation, direct entity links,
repository discussion channels, contributor identity matching, and
consistent loading and activity presentation.
- Keeps branch-specific controls on code-oriented sections while Tasks,
Reviews, and Channels remain repository-scoped, reducing misleading
context and actions.
Replacement for #5981 with an identical final tree flattened into one
signed-off commit because the required DCO check suite remained stalled.
### Related issue
N/A
### Testing
- [x] Desktop pre-push checks, TypeScript typecheck, and unit tests
- [x] E2E production build with `pnpm build:e2e`
- [x] Focused Playwright smoke coverage for project workspace, task,
review, commit, sidebar, and contextual-panel behavior
- [ ] Attach final before/after screenshots after design review
---------
Signed-off-by: Thomas Petersen <thomasp@squareup.com>
Signed-off-by: Wintermute <165f0c871dd2586bb18b6aa109eeaf57bb2132ff4d27b10120f4368a0f627022@buzz.block.builderlab.xyz>
Co-authored-by: Wintermute <165f0c871dd2586bb18b6aa109eeaf57bb2132ff4d27b10120f4368a0f627022@buzz.block.builderlab.xyz>
## Summary
- retire Virtua prepend reconciliation on every ordinary reader wheel
event, including events suppressed from its separate wheel-timing
heuristic
- keep Ctrl+wheel browser zoom excluded from reader ownership
- arm the Ctrl+wheel prepend probe before pagination begins so it cannot
miss the commit
- preserve ESM/CJS patch parity and update the patch lock hash
## Why main was red
PR #2855 added the reader-wheel retirement action after Virtua's
existing suppression guard. Once the first event set that guard, later
events in the same wheel burst returned before retiring prepend mode. A
late ResizeObserver correction could then pull the viewport backward by
20–40px. The same test had failed twice on #2855 but passed its final
retry, so the PR job appeared green; the merge commit lost all three
retries.
The separate Ctrl+wheel failure was a test race: its MutationObserver
was registered after the request had already been triggered and could
miss the prepend commit.
## Validation
- desktop full unit suite: 3,515 passed
- pre-push desktop check: passed
- `git diff --check`: passed
- CI is the E2E verification; no local E2E was run
Fixes the main-branch failure in CI run 30180099007.
Signed-off-by: Wes <wesbillman@users.noreply.github.com>
Co-authored-by: Carl <c7ebe626f000404285d3686e1dc74cc07cc60a9754a150041ba132e14bd3e2ec@buzz.block.builderlab.xyz>
## Summary
- make Virtua the sole prepend geometry/correction owner by accumulating
active prepend ResizeObserver corrections from the live DOM offset
- retire prepend reconciliation on ordinary reader wheel input, while
preserving it for Ctrl+wheel browser zoom
- remove Buzz's competing three-second semantic-anchor watcher and
corrective `scrollBy` loop
- keep ESM/CJS Virtua patch behavior equivalent and update the patch
lock hash
## Why
Buzz admitted prepended rows using seeded estimates, then Virtua
received multiple measurement corrections for the same transaction. Each
correction was based on the same stale model offset, so a later write
replaced an earlier correction instead of accumulating it. In the
reproduced first page, that resurrected 452px of anchor drift; the
app-level watcher merely corrected the lost virtualizer write afterward.
This fixes the correction inside Virtua and deletes the competing app
writer, following the single-owner geometry invariant used by Berd
rather than copying its spacer implementation.
## Validation
- watcher-off desktop virtualization matrix: 11/11 passed, including 15
cascading prepends, continued wheel input, detached rich-row growth,
channel switching, bottom follow, and buffered live arrivals
- focused cascading prepend/Ctrl+wheel regression passed
- desktop typecheck passed
- desktop unit suite passed: 3,495 tests
- Biome passed on changed desktop files
- `git diff --check` clean
## Manual behavior
Load older history repeatedly while scrolling upward, then wheel
downward during/after a prepend. The visible anchor should stay within
the existing 5px contract during reconciliation, and deliberate reader
movement should not be pulled back. Ctrl+wheel during the prepend commit
must not cancel reconciliation.
---------
Signed-off-by: Wes <wesbillman@users.noreply.github.com>
Co-authored-by: Carl <c7ebe626f000404285d3686e1dc74cc07cc60a9754a150041ba132e14bd3e2ec@sprout-oss.stage.blox.sqprod.co>
Co-authored-by: Carl <c7ebe626f000404285d3686e1dc74cc07cc60a9754a150041ba132e14bd3e2ec@buzz.block.builderlab.xyz>
