AJ Isaacs c552372f81 fix(core): copy-on-write for shared Program in tiled parts ...

CloneAtOffset shares the Program instance for tiling performance,
but rotating a part on the plate mutated the shared Program, causing
all parts from the same tile template to rotate together.

Added ownsProgram flag with EnsureOwnedProgram() that clones the
Program before first mutation, preserving tiling performance while
making user rotations independent.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

2026-03-19 21:10:20 -04:00

7.0 KiB

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