A floor with stairs pays for them on every switch to it: the stair layer
is emptied on other floors, so Lit recreates every symbol on each return
and the browser lays out and paints it again. With 250 stairs (the
large-house fixture, the per-floor limit) that was 2,875 SVG elements and
about 40 ms per entry locally; each stair carried 3-7 separate tread lines
with four bound coordinates each.
The treads of one stair are now a single <path class="hp-stair-tread">
with one `M a L b` subpath per tread, in geometry order and with the
numbers the lines carried. Treads of one stair never overlap (straight:
parallel, >= 20 cm apart; spiral: inner ends >= 6.7 cm apart at the
3.6 cm stroke), so the path paints the same pixels at any opacity. The
outline points and the tread data are built once per cached geometry
object (cachedStairMarkup, weak keys), not on every render. The View and
plan-editor layers share the strings; outline, hit polygon, trapezoid,
arrow, attributes and handlers are unchanged. Floor 1 of the fixture
drops from 4,210 to 2,960 elements.
Witnesses: the unit test for the path data and its cache, and the
smoke_stairs markup checks in View and in the plan editor, are red on
dev. The stairs-view-tread-lines mutant restores the View lines.
Issue: #740
User-Visible: no
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_018qZfe7YS4rqEMKoVeS3GKd
A floor switch replaces the whole stage, so the card's pointer-hover
MutationObserver receives hundreds of records whose targets are the same
few containers. Each record re-ran `matches` and a `.devlayer` subtree
`querySelector` on its target, and kept doing so after the device layer
had already been found. The batch logic moves to `deviceLayerMutated` in
device-hit-owner.ts: a node is checked at most once per batch, the first
hit ends the checks, and every added node still goes through
`_syncPointerHoverSubtree` in record order. The card shrinks by 12 lines.
The View stair layer read the card's `_model` getter once more for every
navigable stair; the getter rebuilds the config fingerprint on each read.
`renderLayer` now reads it once.
`languageRenderGate` wrote `lang` on the host on every render. It now
writes it only when the value differs (language switch, English fallback,
a foreign value); an unchanged value is left alone.
No behaviour changes: DOM, tooltips and pixels are the same. Unit tests
count subtree queries per node, `_model` reads per render and `lang`
writes; one mutant per change restores the old behaviour.
Issue: #694
User-Visible: no
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_018qZfe7YS4rqEMKoVeS3GKd
The Plan editor rule `.hp-stair.input-enabled .hp-stair-hit { cursor: move }`
also matched the View layer, which sets input-enabled only to receive
clicks. The hit area sits over the outline, so the link's pointer on the
group was never visible and every stair in View showed a drag it cannot do.
- src/stairs-view.ts: View stairs carry `hp-stair-view`.
- plan.styles.ts: `move` applies only without it; in View the hit area
keeps the group's cursor — pointer on a link, the stage's otherwise.
- demo/smoke_stairs.mjs: computed cursors in View (link, no target) and
in the Plan editor; the two View checks are red on the old code.
- test/stairs.test.mjs: the cascade without Chromium; mutant
view-stair-cursor-move-again.
- docs/STAIRS.md, changelogs.
Issue: #693
User-Visible: yes
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_018qZfe7YS4rqEMKoVeS3GKd
Путь чистого пола строят четыре места рендера, а площадь читают только
подсказка комнаты и PDF. cleanFloorForRoom больше не вычитает лестницы при
построении пути: площадь считается при первом чтении и хранится в том же
закэшированном объекте. geometryMinusStairs передаёт в polyclip только
контуры лестниц, чей габарит пересекает вычитаемую геометрию, — результат
тот же, а комната на этаже с 250 лестницами больше не прогоняет все 250.
Issue: #669
User-Visible: no
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_018qZfe7YS4rqEMKoVeS3GKd
Прямые и винтовые лестницы получили отдельную модель, инструменты редактора, безопасную межэтажную навигацию, вычитание из чистой площади и плоское отображение в 2.5D.
Issue: #663
User-Visible: yes
