Parts created by fill operations share a Program instance via
CloneAtOffset. RotateSelectedParts called Part.Rotate on each,
compounding Program.Rotate on the shared object (1x, 2x, 3x…)
and producing inconsistent bounding boxes. Fix tracks rotated
programs with a HashSet, rotates locations around the group center,
and anchors the bounding box corner to prevent drift.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
aj
195e29da52