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Subtree deletion state cleanup: Expansion records outlive removed branch IDs · case 04

Expansion records outlive removed branch IDs produces the wrong hierarchical widget state in a regression fixture.

Member previewVariant 4 · 3 implementations · 6 checks per implementation

Case contract

Remove a supplied subtree closure atomically. Focus inside the deleted subtree recovers to surviving next sibling, previous sibling, then parent, then first root. Preserve unrelated state; clear only removed anchor, edits, expansion, selection and pending loads.

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
next recovery	`[["r", "a", "x", "z", "q0", "q1", "q2", "q3"], ["a"], ["r", "b"], {"a": 1}, "z", null, null]`	`[["r", "a", "x", "z", "q0", "q1", "q2", "q3"], ["a"], ["r"], {"a": 1}, "z", null, null]`	Failed

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

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