Placement edits were only caught by the fingerprint safety net, so they
undid as an anonymous "Change" or folded into the next edit. Each now
records one labelled step: Fill (at the commit, so a stopped fill that
keeps nothing records nothing), Fill Area, Pattern Tile, Auto Nest (from
the kept proposal only; Make Nests tabs too), Clear Nest, Remove Empty
Plates and Center Parts. Clear Nest no longer warns that it cannot be
undone.
Pattern Tile onto a new plate created a plate beside the empty sentinel,
which the plate manager dropped at once, so the pattern landed on a
detached plate; it now fills the sentinel.
The undo tests share one harness that compares a text description of the
nest before an edit and after Undo.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
ajandClaude Opus 5.5
223bfea47c