Keep cut outlines dark and etch strokes bright green. Assign drawing fills by a golden-angle hue walk with varied saturation/lightness tiers, preserving legacy schemes and rendering-only behavior. Include palette, visibility, persistence, and contrast regressions.
Build paths in the drawing-local frame and translate both ordinary and split cut/lead paths once, without changing CNC programs. Add native Windows regressions using the operator's synthetic G90 fixture and incremental controls. Four absolute-mode cases fail before the fix; all seven pass after.
No-hole parts now choose the outside entry through the S03-S08 pipeline
at the part boundary: rank the native catalogue toward the NEXT cut's
placed-material centre, lazily certify each emitted lead with the shared
validator, cap at maxEntries with side coverage. The next cut is the
next unfinished part on the supplied order (re-read after every
learned-order replan) or, in sequence-free fallback, the nearest
dependency-ready remaining part with stable ordinal ties; the last part
has no target and ranks by tier then arrival distance — never the plate
origin. Target and arrival are converted to prepared LOCAL coordinates
exactly once; geometry is already rotated.
The look-ahead rank survives Follow's ordering: children sort by
nearest source first (the sequence-free tour stays nearest-first), then
contour, then the selection rank — plain OrderBy(Distance) can no longer
undo the facing. Measured fixture (three squares, 0.15 leads, origin
start): legacy cut every sheet at its arrival-nearest lower-left corner
with 10.5-unit cross-sheet rapids totalling 21.0; look-ahead cuts the
+X-facing corner with the same 21.0 total but each inter-part rapid now
starts at the facing edge instead of trailing across the whole sheet.
Uncertain validator answers are never precheck-refused: they skip the
selected slots but flow to the emitted-prefix Check and complete replay,
which stay the authority — a refused-looking incomplete is reported,
not hidden. A fully evaluated catalogue with no fitting lead surfaces
'No tested lead-in fits on part N, contour M'; budget exhaustion stays a
budget finding. Lead prechecks count separately from DFS expansions; the
pipeline itself is one counted expansion per contour. Full backtracking,
dependencies, locked/fixed programs, cutoff handling, emitted-prefix
Check and complete replay are unchanged; budgets and CuttingPartOrder
untouched. Hole parts keep the legacy path until S12.
Fix DuplicateRows_CreateNestsButtonImportsOneDrawingWithCombinedQuantity timeout from Windows run 37526243901. Native trace on DesktopPC showed the sole OK button uses control ID 2, not IDOK 1. Preserve real dialog text and nest assertions; find the sole button and stop polling only after successful posting. All 392 WinForms and 49 FrontEnd tests pass in an interactive Windows session.
aj