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b11e91f6e1
Changing a grid copy child to absolute touched its parent's grid cells and blocked later main cell updates. Separate parent sizing writes from derived grid assignment in the same undo transaction. Skip generic grid reassignment until the derived write, so it cannot touch the parent first. Add a real-event regression for clean parent cells, later main-cell propagation and exact undo/redo. It fails two of sixteen assertions before the fix and passes afterward. A live WASM check passes 27 checks, including exact page-object snapshots through undo and redo for both edits. Validate the final continuation on common JVM (2004 tests / 32919 assertions), common JS (1940 / 31522), frontend (1745 / 13569), backend (1793 / 9007) and exporter (16 / 40). All four modules pass lint and format. All six generated properties pass 40 programs at seed 712 in both runtimes. Golden data is unchanged. The final continuation benchmark passes with no regression flags. Lower quantile ratios against Phase 1e: main 10/100/1000 0.51/0.58/0.57, three levels 0.57, chain 0.53, library 0.57, many shapes 0.45, variant switch 0.66. Machine/JVM differences make these rough comparisons; baseline unchanged. AI-assisted-by: gpt-6