FA-7954 / Selection controls / Member archive

Hierarchical checkbox state: Partially selected parents are announced as fully checked · case 04

Partially selected parents are announced as fully checked.

Member previewVariant 4 · 3 implementations · 11 checks per implementation

Case contract

Subtree actions preserve outside selections; toggle is symmetric; parent status depends only on selected descendants and distinguishes none, mixed and all.

Why this case matters

A deterministic model of hierarchical checkbox state; this isolates one interface invariant without requiring a browser.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
toggle on	`[["a"], "all"]`	`[["a"], "mixed"]`	Failed

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