CardMoveTarget (BoardCommands.swift), LaneMoveTarget's cousin: validates
the clicked card's own current lane against the live lane order rather
than the board's live selection, refuses a target that reaches outside
that lane (no coherent left for a spread), and answers an index —
the clicked card's own position in its lane, clamped — for the
adjacent live lane in either direction. Trash is never a candidate
(not a Lane); a collapsed lane is a fine landing (a fold hides cards,
it doesn't close the lane).
CardFaceView's Navigation rows now call moveCardAcrossLane(by:), which
hands CardMoveTarget's answer straight to BoardStore.moveCards(_:toLane:at:)
— the exact call a released drag makes, so rank-minting, the undo step,
the watcher echo and the banner all come free. Targeting is Copy/Cut's
own widening (targetIDs): the clicked card, or the live selection when
the clicked card is a member of it.
Enablement stays render-safe the way isSelected/selectedCount already
are: three new CardFaceView parameters (hasLeftNeighbor, hasRightNeighbor,
selectionSpansLanes) are hoisted once per lane in LaneView.scrollableCards
and handed down as compared parameters, never read from inside a card
face's own .disabled. Caught and fixed a real regression here during
development: an early cut of the multi-lane-spread check answered true
for any lane that simply didn't contain the selected card, which
flipped a compared parameter for most of the board on an ordinary
single-card select and defeated CardFaceView's equality gate wholesale
(BoardRenderPerformanceTests.selectionStillRepaints caught it at 151 of
180 card faces).
Tests: CardMoveTargetTests (KeyboardGrammarTests.swift) pins the pure
predicate — leftmost/rightmost lane, single lane, index clamping, a
widened group anchoring on the clicked member rather than its own
extent, the multi-lane-spread refusal, and an integration test feeding
the answer straight through moveCards. CardFaceViewEquatableTests
gains a case pinning the three new compared parameters.
Claude-Session: https://claude.ai/code/session_014PtZdPwqZuqEDLc6wZMtEy
rzen
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