Proposal changes stop rebuilding the whole board — lanes and card faces gate on their values

LaneView and CardFaceView become Equatable and are instantiated through .equatable(): the strip's body re-runs on every drop-proposal change, and without the gates that rebuilt every lane and every card face on every cursor move of a drag. The == compares value inputs and window-lived collaborator identities; the closures BoardView rebuilds each pass are deliberately excluded (BoardDropContext.isEquivalent / MarqueeControl. isEquivalent / CardFaceRole.isEquivalent own that judgment). Observation reads inside the bodies still self-invalidate — the lane under the drag keeps re-running; the other lanes stop. Ports the pathfinder's CardView/ColumnView gating pattern (drag-perf suspect #2, card cbb6e476). Claude-Session: https://claude.ai/code/session_01CqjXB7ASoWtbyoGod68k97
2026-08-01 18:28:33 -04:00
parent ef423bb9d2
commit 84f909a720
7 changed files with 497 additions and 2 deletions
@@ -461,6 +461,10 @@ struct BoardView: View {
                marquee: marqueeControl,
                openCard: openCard
            )
+            // **The value gate** (`LaneView.==`): this body re-runs on every drop-proposal change,
+            // and without this every lane on the board — and every card face in it — rebuilds on
+            // every cursor move of every drag.
+            .equatable()
            .frame(width: resizing ? resize.liveWidth : slotWidth, alignment: .leading)
        }
        .frame(width: slotWidth, alignment: .topLeading)