FA-39268 / Tree accessibility / Member archive

Tree branch refresh reconciliation: Refresh cache eviction crosses branch boundary · case 03

Refresh cache eviction crosses branch boundary produces the wrong hierarchical widget state in a regression fixture.

Member previewVariant 3 · 3 implementations · 6 checks per implementation

Case contract

A refresh replaces one branch child list while preserving child identity state for survivors. Removed child closures lose selection, expansion, cached data and edit sessions; descendants of surviving children remain. Fresh child order wins. Focus removed by refresh recovers to the parent; unrelated focus remains.

Why this case matters

Offline executable model of a hierarchical accessibility interaction; inputs are bounded and valid as stipulated. No browser, assistive technology, or normative ARIA conformance is claimed.

One recorded failure

Sample boundary fixture

This sample comes from the broken implementation of a controlled reproducer.

Boundary fixture	Actual	Expected	Outcome
removed child	`[["z", "a", "v0", "v1", "v2"], ["b", "bb"], ["aa", "outside"], ["a"], {"aa": 1, "bb": 2, "outside": 3}, "r", null, ["z", "v0", "v1", "v2"], {"outside": 2, "r": 8}]`	`[["z", "a", "v0", "v1", "v2"], ["b", "bb"], ["aa", "outside"], ["a"], {"aa": 1, "outside": 3}, "r", null, ["z", "v0", "v1", "v2"], {"outside": 2, "r": 8}]`	Failed

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This record includes three runnable implementations, regression fixtures, execution results, and source hashes.

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