forked from Keelrleek/SoulStream
KeelrLeek
0670b8654a
Kyle photographed the artist page interleaved with itself: the identity block parked over the Popular rows with every scroll-driven paint effect at its rest pose — wordmark unshrunk at full size, no fade on the rows passing under it — while the sticky geometry carried on correctly. It healed before it could be probed (no remount: a late measurement or observer delivery snapped it back), and a controlled reload-restore came up perfectly measured under a 14s watch, so the trigger was never pinned. Two answers shipped: THE GATE (backlog #3). The rotation TICK already skipped while the app scrolled recently, but that gate was start-only: a cache-miss payload — multi-MB raw-RGBA IPC + decode + texture/twin bake, a measured ~150ms main-thread task — used to COMMIT whenever its promise resolved, an arbitrary moment relative to input. All four commit sites (GPU ready, preview paint, 4K finish crossfade, rotation/final) now route through deferHeroCommit, which waits for the same 600ms calm the tick waits for. The OLD banner and its twin stay mounted for the whole wait, so the mono overlay never sits empty mid-scroll; first paints are exempt (an empty hero is worse than a busy frame); a newer render supersedes a parked older one so it paints once; switching artists drops any parked commit; and the expensive snapshotGpuTwins bake rides INSIDE the deferred commit — it is the very task the gate exists to keep out of a scroll. gpuHeroReady clears heroLoadInFlight immediately (the load IS done; only the paint waits), so a superseded unpainted commit can never wedge the rotation machinery. THE TRIPWIRE (dev builds, dark glass only). Once a second, at scroll calm so a mid-flick frame gap never false-trips: compare the gfade ride's clock against scrollTop, and check --travel for the pre-measure sentinel plus dead or missing timelines. Faults land in globalThis.__heroTripwire and console.error as one latched snapshot per episode. Self-tested by injecting the sentinel with a 120px scroll: tripped exactly travel-sentinel within one tick while correctly NOT flagging the healthy ride (ct 4.29% = 120/2797). Next time the page breaks in someone's hands it hands over the culprit instead of a screenshot mystery. Verified live: a natural rotation completed through the calm path (heroGpuMs restamped 10.70 -> 29.60 during a fronted 26s watch).