Track-only rows that check they hit the whole-document-redraw path and
print the refreshed pixel count: undo of a brush dab on a 16-bit
15000x10000 full-canvas layer (reps capped at 5) and a fill of a 2 %
selection on a 24 MP full-canvas layer.
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>