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step_damage pairs layers by id and steps over a layer only one side has when it draws nothing (an empty pixel layer or group in Normal/Pass Through, no masks, effects or Advanced Blending, not a clipping base), so New Layer, New Group and their undo/redo report no damage. Adds the P51 perf scenario (new layer in the 150-layer document). Fixes #1771. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>