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`.
- Split DSH_COVERAGE_MAX_WORKERS between the two parallel gates
(instrumented gets ~2/3, exempt gets ~1/3, both at least 1) so the
lane never exceeds the budget the failover pool's 8 x 6-instance
bound assumes; a budget of 1 pairs with DSH_GATE_CONCURRENCY=1 on
the serial reference lanes, which already prevents gate overlap.
- Fail loud on a set-but-not-'1' DSH_COVERAGE_EXEMPT_HEAVY value in
vitest.config.ts instead of silently ignoring it.
- Add coverage-exempt.spec.ts: each roster entry's filter and exclude
must select the same non-empty spec set and entries must not
overlap, so a renamed suite breaks the gate instead of silently
returning to the instrumented run with a stale roster.
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 coverage lane's wall clock was pinned by a few compiler- and
subprocess-bound suites whose v8 instrumentation tax is a multiple of
their runtime while contributing nothing the per-file thresholds need:
typert generator fixtures (whole-workspace compiler analysis; its src is
threshold-excluded) and three scripts/ child-process fixture suites
(scripts/ sources are never coverage-measured; in-process imports are
covered by their owning package tests).
Split ci-coverage into two parallel gates: the instrumented run sets
DSH_COVERAGE_EXEMPT_HEAVY=1 and vitest.config.ts drops the exempt suites
from both projects (CLI --exclude cannot reach per-project include
resolution); a second uninstrumented gate runs exactly those suites, so
the aggregate still executes every test. Membership contract and the
filter/exclude pairs live in scripts/coverage-exempt.ts.
Local 6-worker A/B: instrumented gate 900s -> 260s wall; exempt gate
262s wall runs beside it, so the lane converges near the slower of the
two (~4.4min vs ~7min single-gate). DSH_GATE_CONCURRENCY now has two
schedulable gates in this lane.
creatixchu
Tianyi Cui
imccyu
Turtle
imccyu
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