Copies still use stored main data after its component is deleted. Follow
that data both when collecting inherited groups and when matching variant
children, so a switch keeps inherited size, orientation and child fills.
Portable live/deleted controls fail four assertions before the fix and
pass all 16 afterward, including repeat sync and exact undo. Library
seed 712 case 1462 and its 12-step shrink both pass. Focused regression
and golden checks pass 148 tests, 2593 assertions; goldens are unchanged.
Live WASM verifies height 80, rotation 45, child fill, groups, undo/redo
and later main opacity propagation.
Component benchmark ratios: mains 0.51/0.58/0.56; levels 0.50;
chain 0.51; library 0.59; many shapes 0.48; variant switch 0.71.
All worlds pass the unchanged baseline gate.
AI-assisted-by: GPT-6
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