FA-7935 / Selection controls / Member archive

Hierarchical checkbox state: Selecting a subtree erases selections outside it · case 05

Selecting a subtree erases selections outside it.

Member previewVariant 5 · 3 implementations · 12 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
all keeps outside	`[["a", "b"], "all"]`	`[["a", "b", "x"], "all"]`	Failed

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

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