The first version coupled the layers from two places: a `scroll` listener
and a layout effect keyed on the committed draft. Mutation-testing each
hook alone against the built client shows the effect never fires the only
assignment that matters — with just the layout effect disabled the browser
scenario stays green, while disabling just the listener fails it.
Both premises behind the effect were wrong. Typing scrolls the caret into
view, which is an ordinary `scroll`. A draft that shrinks past the current
offset clamps both layers to the same maximum, because their extents are
equal — measured in chromium at 964/964, 1012/1012, 844/844 and 820/820 for
plain, soft-wrapped, unbreakable-run and highlighted drafts — and the
textarea's clamp fires `scroll` too.
The hazard the effect was imagined to cover does not exist either: React
replacing every child of the backdrop when the decoration set changes shape
preserves `scrollTop` (measured: 300 stays 300 through a full child
replacement), and the only replacement that zeroes it shrinks the content
below the offset, which is the clamp case already covered.
The e2e's edit case survives, retitled to say what it actually pins: that
typing is not a separate case needing its own mirror. The unit spec now
asserts the backdrop tracks a second move back to the top, which a one-shot
mirror would fail.
A composer draft past the 14-line cap could not be scrolled: the caret and
the selection moved, but the words stayed frozen at line 1, so the tail of
anything longer than the cap was unreachable while writing it.
The composer paints its text in two stacked layers. The textarea owns the
value, the selection and the caret but renders its own glyphs transparent;
every visible character is painted by the decoration backdrop beneath it,
which also carries the claim-token highlight, the chips and the ghost hint.
The backdrop is `inset: 0; overflow: hidden` — clipped, not scrolled — and
nothing linked its offset to the textarea's. Below the cap both layers rest
at 0, which is why the defect hid behind every short-draft screenshot and
fixture.
InputBar now mirrors the textarea's scrollTop onto the backdrop, from a
`scroll` listener (every gesture and every caret-driven scroll) and from a
layout effect keyed on the committed draft (an edit reflows both layers
without necessarily firing a scroll event).
Scrolling is layout, so jsdom cannot show this: the unit spec stubs both
offsets and proves the mirroring paths run, while a new browser scenario
measures the user-visible fact against the built client with a DOM Range
over the backdrop's own text — after a wheel gesture over a 40-line draft
the last line is on screen and the first has scrolled out. Confirmed both
directions: with the mirroring reverted and the packages rebuilt, the
golden reads `last draft line is on screen: false` while `textarea moved:
true`.
Agent Note (both languages, pairing recorded): what is exempted, the
per-entry reconciliation showing no threshold input changes, the
membership contract, and why the per-file 100% thresholds police the
roster automatically.
The row moves from web.cordis.yml to base.cordis.yml, so the TUI reports
too (its exit paths already drain: disposeRootAndExit on normal exit, root
dispose before the /resume execve). The TUI launcher applies the same
resolveTelemetryPatch opt-out, judged against the tree actually booting via
configHasTelemetryRow so a --config-replace tree without the row is not
failed by a switch with nothing to disable. The TUI keyless smoke disables
telemetry in its child env; README (en/zh) and the Agent Note pair updated
to the every-surface stance.
The pairing gate requires both sides of a bilingual pair to link the same
target; point the zh side's cross-references at the English canonical files
and re-record both i18n pairings.
Pins the deployment rulings: default-on with the production endpoint,
DSH_TELEMETRY_OTLP_URL / DSH_TELEMETRY_DISABLED env seams, 10s cadence,
the ~1s exit-drain parameter set, CI isolation, and the explicit
follow-ups (redaction, identity resource, TUI adoption, metrics).
creatixchu