alonso.torres dca1b16636 🐛 Author pushed content against its new nested reference
When a pushed swap takes a position with the same component, preserve
content differences as overrides on the promoted head and descendants.
The source copy clears its overrides and follows the promoted subtree.

Portable regression: three failures before the fix; now passes, including
full sync and exact undo. Focused JVM suites: 121 tests, 638 assertions.

Component benchmark ratios: mains 0.61/0.78/0.69; levels 0.53;
chain 0.50; library 0.56; many shapes 0.75; variant switch 0.61.
All worlds pass the baseline performance gate.

AI-assisted-by: GPT-6
2026-10-30 09:50:18 +01:00
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