FA-7937 / Selection controls / Member archive

Hierarchical checkbox state: Clearing a subtree also clears independent selections · case 02

Clearing a subtree also clears independent selections.

Member previewVariant 2 · 3 implementations · 9 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
none keeps outside	`[[], "none"]`	`[["x"], "none"]`	Failed

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

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