Write a change behind a whole write whole

A change made while a whole write of the canvas's own is on its way now
goes whole too. Merged, it named only what differed from the canvas's
first drawing, so a field set back meanwhile (a lineup renamed and named
back, say) was left as the whole write had it.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
ff23983222Dara Adedeji committed on 10/10/2026, 7:12:38 AMparent5e7813d

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