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Jamie Pine
c7f50d5668
Tiny + strips sit at the top of the topmost label cell and the bottom of the bottommost one, sticky-positioned in the label column so they follow horizontal scroll. Clicking either extends the visible track stack in that direction by one — above adds max(existing)+1, below adds min(existing)-1. Both compute against the full set (defaults + item-derived + previously-added) so successive clicks keep extending instead of fighting over the same number. Empty extras live in component state because a track only earns its keep once a clip lands on it. Once one does, item.track carries the number forward and the row keeps deriving from items naturally; if nothing lands there before reload, the empty row simply isn't there next time, which matches what the user expects of an unused affordance.