# Evidence round 2 for [#33038](https://git.cafe/pingdotgg/t3code/pull/33038)
Captured **3/3 requested rows**, before [d1aeed2492](https://git.cafe/pingdotgg/t3code/commit/d1aeed249288585390dbac4fde5b54c35bd5fc06) and after [b78ce3405f](https://git.cafe/pingdotgg/t3code/commit/b78ce3405f725938b6643a2543ae3be33dc3067d), using each revision's real web app in its own worktree with `T3CODE_DEV_SEED=0`. Both databases were created by their own server and populated with synthetic Replay (dev) turns. No live userdata was read or copied. No implementation or PR body was changed.
**Beyond the PR title:** F11 also changes restored minimap strip highlights. These are visible in the still diff and detailed below.
**Rendering environment for every capture:** T3 browser preview; Linux x86_64 Chrome 157; no device emulation; 1440×900 CSS px; DPR 2 (2880×1800 files); zoom 1; default font scaling, 16px root; fine pointer; light theme. JS Date frozen to 2026-11-10T09:00:00Z, with timers/performance clock running.
Each selected still passed fonts-ready, 500ms resource-idle and two screenshots 500ms apart with **zero changed pixels**. The tool does not expose reduced-motion emulation (media query stayed false); infinite animations were paused at time zero and finite transitions finished before stills. Videos retain ordinary animation. All selected captures and diff images were inspected; recordings were reviewed using extracted contact frames throughout the sequence.
Diff0 = per-channel absolute RGB difference ×255, saturated; DiffT = white where maximum channel difference **>8/255**. Diffs cover the entire surface, without cropping. Timestamped originals are recorded in [selected.json](https://gh-file-drop-api-prod-mi5fy3sowv63ufte.pinglabs.workers.dev/f/0d7f2a26d97df08e/selected.json); individual recording and still measurements are linked below. Time references below refer to **the elapsed clock printed in the recording overlay**, not the player's clock. Recorder lead-in and scheduling vary.
## F11 — thread switch — 1440×900 light
Prepare two nine-turn threads: A at bottom, B remembered 300px above bottom. A's details panel is closed and B's is open on both revisions. Switch using the sidebar with no corrective scroll after either switch.
| Overlay time, before / after | Action and observation |
|---|---|
| 0.00 / 0.00s | A at bottom: distance 0, scrollTop 457. Next enabled before, disabled after. |
| 2.05 / 2.04s | Click B. |
| 5.57 / 5.42s | B restored: distance 300, scrollTop 157; Next enabled on both. Before has no highlighted strips; after highlights strips 2–8. |
| 7.64 / 7.46s | Click A. |
| 11.03 / 10.74s | A restored at distance 0. Next remains enabled before, disabled after. After highlights strips 5–9; before has none. |
| Before | After |
|---|---|
| [F11 recording — before](https://gh-file-drop-api-prod-mi5fy3sowv63ufte.pinglabs.workers.dev/f/3c7278dfd3234ae7/F11-before.mp4)
[d1aeed2492](https://git.cafe/pingdotgg/t3code/commit/d1aeed249288585390dbac4fde5b54c35bd5fc06) | [F11 recording — after](https://gh-file-drop-api-prod-mi5fy3sowv63ufte.pinglabs.workers.dev/f/a8f067fb0b79b9b5/F11-after.mp4)
[b78ce3405f](https://git.cafe/pingdotgg/t3code/commit/b78ce3405f725938b6643a2543ae3be33dc3067d) |
Supplemental settled A-restored stills, pointer outside minimap:
| Before | After | Diff0 | DiffT (>8/255) |
|---|---|---|---|
| 
[d1aeed2492](https://git.cafe/pingdotgg/t3code/commit/d1aeed249288585390dbac4fde5b54c35bd5fc06) | 
[b78ce3405f](https://git.cafe/pingdotgg/t3code/commit/b78ce3405f725938b6643a2543ae3be33dc3067d) | 
[d1aeed2492](https://git.cafe/pingdotgg/t3code/commit/d1aeed249288585390dbac4fde5b54c35bd5fc06) → [b78ce3405f](https://git.cafe/pingdotgg/t3code/commit/b78ce3405f725938b6643a2543ae3be33dc3067d) | 
[d1aeed2492](https://git.cafe/pingdotgg/t3code/commit/d1aeed249288585390dbac4fde5b54c35bd5fc06) → [b78ce3405f](https://git.cafe/pingdotgg/t3code/commit/b78ce3405f725938b6643a2543ae3be33dc3067d) |
Both have scrollHeight 1305, clientHeight 848 and nine strips. One natural restore scroll event occurs for each switch on each revision. The driver does not correct the position during recording.
What else changed: the restored strip highlights account for **320 changed device pixels** in these stills. Layout, text, positions and composer are otherwise pixel-identical. Next state is shown by the recording's measurements; the unhovered stills hide its control.
Measurements: [before recording](https://gh-file-drop-api-prod-mi5fy3sowv63ufte.pinglabs.workers.dev/f/03ba27689461481b/F11-before-measurements.json), [after recording](https://gh-file-drop-api-prod-mi5fy3sowv63ufte.pinglabs.workers.dev/f/40190b1dc4278ba1/F11-after-measurements.json), [before still](https://gh-file-drop-api-prod-mi5fy3sowv63ufte.pinglabs.workers.dev/f/a803f52d9b1fc842/F11-before-still-measurements.json), [after still](https://gh-file-drop-api-prod-mi5fy3sowv63ufte.pinglabs.workers.dev/f/75e0f9e5903c5940/F11-after-still-measurements.json).
## F18 — detached exact-bottom footer growth — 1440×900 light
Create a pending Replay question. Start at the exact bottom (scrollTop 814, scrollHeight 1662, clientHeight 848). Release follow with a **synthetic, untrusted upward WheelEvent without moving scrollTop**. Queue a long synthetic prompt through the app's normal startTurn command with dispatchMode queue; no DOM footer injection is used.
| Overlay time, before / after | Action and observation |
|---|---|
| 0.00 / 0.00s | Pending question at distance 0. Next enabled before, disabled after. |
| 2.05 / 2.04s | Dispatch upward wheel to release follow without scrolling. |
| 3.63 / 3.64s | Detached at exact bottom; zero scroll events. |
| 5.19 / 5.17s | Queue the same long prompt through app RPC. |
| 8.95 / 8.83s | Footer grown: scrollHeight 2044, distance 382, scrollTop still 814, ten strips, zero scroll events. Next enabled on both; after re-enabled following footer growth. |
| Before | After |
|---|---|
| [F18 recording — before](https://gh-file-drop-api-prod-mi5fy3sowv63ufte.pinglabs.workers.dev/f/613b0b64c78ec30a/F18-before.mp4)
[d1aeed2492](https://git.cafe/pingdotgg/t3code/commit/d1aeed249288585390dbac4fde5b54c35bd5fc06) | [F18 recording — after](https://gh-file-drop-api-prod-mi5fy3sowv63ufte.pinglabs.workers.dev/f/cd437e0484ed3c4b/F18-after.mp4)
[b78ce3405f](https://git.cafe/pingdotgg/t3code/commit/b78ce3405f725938b6643a2543ae3be33dc3067d) |
Settled end state, same coordinates and pointer hovering Next:
| Before | After | Diff0 | DiffT (>8/255) |
|---|---|---|---|
| 
[d1aeed2492](https://git.cafe/pingdotgg/t3code/commit/d1aeed249288585390dbac4fde5b54c35bd5fc06) | 
[b78ce3405f](https://git.cafe/pingdotgg/t3code/commit/b78ce3405f725938b6643a2543ae3be33dc3067d) | 
[d1aeed2492](https://git.cafe/pingdotgg/t3code/commit/d1aeed249288585390dbac4fde5b54c35bd5fc06) → [b78ce3405f](https://git.cafe/pingdotgg/t3code/commit/b78ce3405f725938b6643a2543ae3be33dc3067d) | 
[d1aeed2492](https://git.cafe/pingdotgg/t3code/commit/d1aeed249288585390dbac4fde5b54c35bd5fc06) → [b78ce3405f](https://git.cafe/pingdotgg/t3code/commit/b78ce3405f725938b6643a2543ae3be33dc3067d) |
The endpoint is intentionally identical (**0 changed pixels**); the action recordings establish the disabled→enabled transition on after and unchanged enabled state on before. End stills were recaptured after a fresh browser load at the measured endpoint to normalize animation phase; they do not independently prove the no-scroll path. The long queued footer extends below the viewport behind the fixed pending-question composer on both sides.
What else changed: no settled pixel differences. Both recordings show the same 382px growth and zero timeline scroll events. Overlay times and recording duration differ with tool scheduling; no latency comparison is claimed.
Measurements: [before recording](https://gh-file-drop-api-prod-mi5fy3sowv63ufte.pinglabs.workers.dev/f/5b6c83ef29db07d9/F18-before-measurements.json), [after recording](https://gh-file-drop-api-prod-mi5fy3sowv63ufte.pinglabs.workers.dev/f/c0ba1eb54abbec32/F18-after-measurements.json), [before still](https://gh-file-drop-api-prod-mi5fy3sowv63ufte.pinglabs.workers.dev/f/2a4ae1f8ff874556/F18-before-still-measurements.json), [after still](https://gh-file-drop-api-prod-mi5fy3sowv63ufte.pinglabs.workers.dev/f/6eb1f1b82bfc8410/F18-after-still-measurements.json).
## C01 — LABELLED GuestPage harness — 1440×900 light
**Harness scope:** each real app imports and renders its actual GuestPage, with nine synthetic turns, a synthetic guest session/view and schema-valid mocked EventSource snapshot. The header visibly identifies the harness. Connect is unavailable on this VM; actual guest authentication, share creation, signed links and real remote streaming are **unverified**.
The same scripted bottom→away→Next→bottom interaction is recorded:
| Overlay time, before / after | Action and observation |
|---|---|
| 0.00 / 0.00s | Bottom: distance 0, scrollTop 777. Next enabled before, disabled after. |
| 2.54 / 2.53s | Release follow and move 120px above bottom. Next becomes enabled after. |
| 5.59 / 5.58s | Click Next turn at distance 120. |
| 8.63 / 8.61s | Local navigation restores distance 0. Next remains enabled before, disabled after. |
| Before | After |
|---|---|
| [C01 HARNESS recording — before](https://gh-file-drop-api-prod-mi5fy3sowv63ufte.pinglabs.workers.dev/f/c81ac73a161973f8/C01-before.mp4)
[d1aeed2492](https://git.cafe/pingdotgg/t3code/commit/d1aeed249288585390dbac4fde5b54c35bd5fc06) | [C01 HARNESS recording — after](https://gh-file-drop-api-prod-mi5fy3sowv63ufte.pinglabs.workers.dev/f/d2d9467b63e8e016/C01-after.mp4)
[b78ce3405f](https://git.cafe/pingdotgg/t3code/commit/b78ce3405f725938b6643a2543ae3be33dc3067d) |
Settled bottom, pointer at Next location:
| Before | After | Diff0 | DiffT (>8/255) |
|---|---|---|---|
| 
[d1aeed2492](https://git.cafe/pingdotgg/t3code/commit/d1aeed249288585390dbac4fde5b54c35bd5fc06) | 
[b78ce3405f](https://git.cafe/pingdotgg/t3code/commit/b78ce3405f725938b6643a2543ae3be33dc3067d) | 
[d1aeed2492](https://git.cafe/pingdotgg/t3code/commit/d1aeed249288585390dbac4fde5b54c35bd5fc06) → [b78ce3405f](https://git.cafe/pingdotgg/t3code/commit/b78ce3405f725938b6643a2543ae3be33dc3067d) | 
[d1aeed2492](https://git.cafe/pingdotgg/t3code/commit/d1aeed249288585390dbac4fde5b54c35bd5fc06) → [b78ce3405f](https://git.cafe/pingdotgg/t3code/commit/b78ce3405f725938b6643a2543ae3be33dc3067d) |
Both have scrollHeight 1508, clientHeight 731 and nine strips. What else changed: the disabled Next control loses its visible chevron and hover background; **1562 device pixels** differ at zero threshold. All other still pixels match. The smooth local return emits eight scroll events before and nine after, which is animation sampling variation; positions and final highlights match. The partial earlier reply at the viewport's top is the natural scrolled timeline boundary on both sides.
Measurements: [before recording](https://gh-file-drop-api-prod-mi5fy3sowv63ufte.pinglabs.workers.dev/f/fe13de15cd626068/C01-before-measurements.json), [after recording](https://gh-file-drop-api-prod-mi5fy3sowv63ufte.pinglabs.workers.dev/f/b2eaa71c12d133da/C01-after-measurements.json), [before still](https://gh-file-drop-api-prod-mi5fy3sowv63ufte.pinglabs.workers.dev/f/2756c94c7caeb0c1/C01-before-still-measurements.json), [after still](https://gh-file-drop-api-prod-mi5fy3sowv63ufte.pinglabs.workers.dev/f/edfaa7cb11c17e5c/C01-after-still-measurements.json).
## Reproduction and audit files
[Detailed setup and reproduction notes](https://gh-file-drop-api-prod-mi5fy3sowv63ufte.pinglabs.workers.dev/f/d174052450880b9f/workflow-r2.md). Written seed and driver scripts:
- [seed-r2.sh](https://gh-file-drop-api-prod-mi5fy3sowv63ufte.pinglabs.workers.dev/f/e9155e6c4a00b259/seed-r2.sh) — fresh synthetic Replay histories.
- [browser-driver-r2.js](https://gh-file-drop-api-prod-mi5fy3sowv63ufte.pinglabs.workers.dev/f/77d44cba6102f0e3/browser-driver-r2.js) — clock, theme and geometry helpers.
- [measure-driver.js](https://gh-file-drop-api-prod-mi5fy3sowv63ufte.pinglabs.workers.dev/f/5ebf7e8352da96c7/measure-driver.js) — overlay, event count and samples.
- [rpc-driver.js](https://gh-file-drop-api-prod-mi5fy3sowv63ufte.pinglabs.workers.dev/f/2150e5f91d7b5565/rpc-driver.js) — normal app commands for pending question and queued prompt.
- [guest-harness.js](https://gh-file-drop-api-prod-mi5fy3sowv63ufte.pinglabs.workers.dev/f/b532a27bc6a82136/guest-harness.js) — explicitly synthetic GuestPage transport.
- [run-F11.js](https://gh-file-drop-api-prod-mi5fy3sowv63ufte.pinglabs.workers.dev/f/81b2dfcc314c2a4f/run-F11.js), [run-F18.js](https://gh-file-drop-api-prod-mi5fy3sowv63ufte.pinglabs.workers.dev/f/bdf280d59ba4f8e2/run-F18.js), [run-C01.js](https://gh-file-drop-api-prod-mi5fy3sowv63ufte.pinglabs.workers.dev/f/529a3db2a204555f/run-C01.js) — matching recording sequences.
- [capture-still.js](https://gh-file-drop-api-prod-mi5fy3sowv63ufte.pinglabs.workers.dev/f/f0d1e33a5cc160fd/capture-still.js) — fonts/resource-idle, animation normalization and two-frame check.
- [diff-driver.py](https://gh-file-drop-api-prod-mi5fy3sowv63ufte.pinglabs.workers.dev/f/757f4061ed71f6b0/diff-driver.py), [diff-statistics.json](https://gh-file-drop-api-prod-mi5fy3sowv63ufte.pinglabs.workers.dev/f/2ebe4d99d545807d/diff-statistics.json), [selected.json](https://gh-file-drop-api-prod-mi5fy3sowv63ufte.pinglabs.workers.dev/f/0d7f2a26d97df08e/selected.json).
- [Sanitized diagnostics and identical-frame check images](https://gh-file-drop-api-prod-mi5fy3sowv63ufte.pinglabs.workers.dev/f/aa15efbb0d648e4c/diagnostics-sanitized.tar.gz) — startup/install/seed logs with credentials and provider metadata removed; chosen JSON and second check frames.
No requested row is missing. C01 is the authorized harness fallback, not proof of real guest transport. Optional guest footer/header variants, other viewport/theme combinations, desktop and mobile were not captured in this round.
Both capture servers and their web/server child processes were stopped using tracked PIDs or verified owners of their own ports. The owned preview tab was closed. Both capture worktrees had clean tracked status at the requested commits before removal; no new commits existed to preserve.
## ghdrop output, verbatim
The following is the uploader's stdout for the 44 selected artifacts/scripts (videos use ordinary links):
```markdown
[C01-after-measurements.json](https://gh-file-drop-api-prod-mi5fy3sowv63ufte.pinglabs.workers.dev/f/b2eaa71c12d133da/C01-after-measurements.json)
[C01-after-still-measurements.json](https://gh-file-drop-api-prod-mi5fy3sowv63ufte.pinglabs.workers.dev/f/edfaa7cb11c17e5c/C01-after-still-measurements.json)
[C01-after.mp4](https://gh-file-drop-api-prod-mi5fy3sowv63ufte.pinglabs.workers.dev/f/d2d9467b63e8e016/C01-after.mp4)
[C01-before-measurements.json](https://gh-file-drop-api-prod-mi5fy3sowv63ufte.pinglabs.workers.dev/f/fe13de15cd626068/C01-before-measurements.json)
[C01-before-still-measurements.json](https://gh-file-drop-api-prod-mi5fy3sowv63ufte.pinglabs.workers.dev/f/2756c94c7caeb0c1/C01-before-still-measurements.json)
[C01-before.mp4](https://gh-file-drop-api-prod-mi5fy3sowv63ufte.pinglabs.workers.dev/f/c81ac73a161973f8/C01-before.mp4)
[F11-after-measurements.json](https://gh-file-drop-api-prod-mi5fy3sowv63ufte.pinglabs.workers.dev/f/40190b1dc4278ba1/F11-after-measurements.json)
[F11-after-still-measurements.json](https://gh-file-drop-api-prod-mi5fy3sowv63ufte.pinglabs.workers.dev/f/75e0f9e5903c5940/F11-after-still-measurements.json)
[F11-after.mp4](https://gh-file-drop-api-prod-mi5fy3sowv63ufte.pinglabs.workers.dev/f/a8f067fb0b79b9b5/F11-after.mp4)
[F11-before-measurements.json](https://gh-file-drop-api-prod-mi5fy3sowv63ufte.pinglabs.workers.dev/f/03ba27689461481b/F11-before-measurements.json)
[F11-before-still-measurements.json](https://gh-file-drop-api-prod-mi5fy3sowv63ufte.pinglabs.workers.dev/f/a803f52d9b1fc842/F11-before-still-measurements.json)
[F11-before.mp4](https://gh-file-drop-api-prod-mi5fy3sowv63ufte.pinglabs.workers.dev/f/3c7278dfd3234ae7/F11-before.mp4)
[F18-after-measurements.json](https://gh-file-drop-api-prod-mi5fy3sowv63ufte.pinglabs.workers.dev/f/c0ba1eb54abbec32/F18-after-measurements.json)
[F18-after-still-measurements.json](https://gh-file-drop-api-prod-mi5fy3sowv63ufte.pinglabs.workers.dev/f/6eb1f1b82bfc8410/F18-after-still-measurements.json)
[F18-after.mp4](https://gh-file-drop-api-prod-mi5fy3sowv63ufte.pinglabs.workers.dev/f/cd437e0484ed3c4b/F18-after.mp4)
[F18-before-measurements.json](https://gh-file-drop-api-prod-mi5fy3sowv63ufte.pinglabs.workers.dev/f/5b6c83ef29db07d9/F18-before-measurements.json)
[F18-before-still-measurements.json](https://gh-file-drop-api-prod-mi5fy3sowv63ufte.pinglabs.workers.dev/f/2a4ae1f8ff874556/F18-before-still-measurements.json)
[F18-before.mp4](https://gh-file-drop-api-prod-mi5fy3sowv63ufte.pinglabs.workers.dev/f/613b0b64c78ec30a/F18-before.mp4)
[browser-driver-r2.js](https://gh-file-drop-api-prod-mi5fy3sowv63ufte.pinglabs.workers.dev/f/77d44cba6102f0e3/browser-driver-r2.js)
[capture-still.js](https://gh-file-drop-api-prod-mi5fy3sowv63ufte.pinglabs.workers.dev/f/f0d1e33a5cc160fd/capture-still.js)
[diagnostics-sanitized.tar.gz](https://gh-file-drop-api-prod-mi5fy3sowv63ufte.pinglabs.workers.dev/f/aa15efbb0d648e4c/diagnostics-sanitized.tar.gz)
[diff-driver.py](https://gh-file-drop-api-prod-mi5fy3sowv63ufte.pinglabs.workers.dev/f/757f4061ed71f6b0/diff-driver.py)
[diff-statistics.json](https://gh-file-drop-api-prod-mi5fy3sowv63ufte.pinglabs.workers.dev/f/2ebe4d99d545807d/diff-statistics.json)
[guest-harness.js](https://gh-file-drop-api-prod-mi5fy3sowv63ufte.pinglabs.workers.dev/f/b532a27bc6a82136/guest-harness.js)
[measure-driver.js](https://gh-file-drop-api-prod-mi5fy3sowv63ufte.pinglabs.workers.dev/f/5ebf7e8352da96c7/measure-driver.js)
[rpc-driver.js](https://gh-file-drop-api-prod-mi5fy3sowv63ufte.pinglabs.workers.dev/f/2150e5f91d7b5565/rpc-driver.js)
[run-C01.js](https://gh-file-drop-api-prod-mi5fy3sowv63ufte.pinglabs.workers.dev/f/529a3db2a204555f/run-C01.js)
[run-F11.js](https://gh-file-drop-api-prod-mi5fy3sowv63ufte.pinglabs.workers.dev/f/81b2dfcc314c2a4f/run-F11.js)
[run-F18.js](https://gh-file-drop-api-prod-mi5fy3sowv63ufte.pinglabs.workers.dev/f/bdf280d59ba4f8e2/run-F18.js)
[seed-r2.sh](https://gh-file-drop-api-prod-mi5fy3sowv63ufte.pinglabs.workers.dev/f/e9155e6c4a00b259/seed-r2.sh)
[selected.json](https://gh-file-drop-api-prod-mi5fy3sowv63ufte.pinglabs.workers.dev/f/0d7f2a26d97df08e/selected.json)
[workflow-r2.md](https://gh-file-drop-api-prod-mi5fy3sowv63ufte.pinglabs.workers.dev/f/d174052450880b9f/workflow-r2.md)
```