A switch can retain the copy root's resized geometry while leaving its
untouched children in the old frame. After geometry carry, sync the new
subtree from the updated builder objects so constraints place its children
without adding overrides. Reuse the direct component sync entry point.
The portable rotated-root regression fails before the fix with a 30px
child offset. Swap and variant suites pass 108 tests / 539 assertions;
the pure golden master matches 1149 assertions unchanged. Full frontend:
1517 tests / 8436 assertions. Live ws1 WASM retains the resized root and
child placement, with no exception or pending reflow.
Benchmark ratios: main 10/100/1000 copies 0.48/0.56/0.57;
three levels 0.49; chain 0.48; library 0.50; many shapes 0.45;
variant switch 0.61. No slowdown flags.
AI-assisted-by: GPT-6
955650c618