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Hierarchical filter projection: Filtering silently deletes hidden selections · case 05

Filtering silently deletes hidden selections produces the wrong hierarchical widget state in a regression fixture.

Member previewVariant 5 · 3 implementations · 6 checks per implementation

Case contract

Matching rows retain all ancestors as context. Context-only branches auto-open without changing saved expansion. Selection remains by ID across filtering; focus hidden by the filter returns to nearest projected ancestor. Sibling positions are recomputed among projected children.

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
deep match	`[["z", "a", "b", "q"], ["a", "q", "z"], ["q"], "a", {"a": 1, "b": 1, "q": 2, "z": 1}, {"a": 1, "b": 1, "q": 2, "z": 2}, ["z", "a"], false]`	`[["z", "a", "b", "q"], ["a", "q", "z"], ["c", "q"], "a", {"a": 1, "b": 1, "q": 2, "z": 1}, {"a": 1, "b": 1, "q": 2, "z": 2}, ["z", "a"], false]`	Failed

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

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