The first is a second instance of a rule CLAUDE.md already states, with numbers: a virtualized list can be repainting for a reason you are about to delete, and here there are two such reasons — so removing either alone changes nothing observable, and removing both leaves the highlight seconds late rather than absent. That is the shape a poll cannot see, which is the general lesson worth keeping. The second is the hit-scan, because it stopped a wrong fix: the queue panel is 12% link and the track list 21%, which is the opposite of the assumption the fix was being built on.