FA-39353 / Tree accessibility / Member archive

Hierarchical drag hover expansion timer: Hover expansion ignores descendant-drop or permission rejection · case 03

Hover expansion ignores descendant-drop or permission rejection produces the wrong hierarchical widget state in a regression fixture.

Member previewVariant 3 · 3 implementations · 10 checks per implementation

Case contract

Hover expansion processing occurs only after dwell on a legal branch. Already user-open branches must not acquire hover ownership. Leaving or changing target resets the timer. A drag generation prevents old timers expanding a later drag. Auto-opened branches close on cancelled drag but user-open branches remain.

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
illegal descendant	`[["a", "c", "r"], ["a", "c"], null, true]`	`[["a", "r"], ["a"], null, false]`	Failed

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

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