FA-39300 / Tree accessibility / Member archive

Nested tree event ownership: Foreign tree events are accepted by ancestor · case 05

Foreign tree events are accepted by ancestor produces the wrong hierarchical widget state in a regression fixture.

Member previewVariant 5 · 3 implementations · 9 checks per implementation

Case contract

A nested tree handles row events only for its nearest owning tree. Composed event paths may contain row editors and embedded widgets. Editing-origin keys remain with the editor; handled child-tree events do not bubble into ancestor tree commands. Disabled rows suppress activation but still permit context inspection.

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
outer listener	`[true, "b", false, false, false, false, "a"]`	`[false, "b", false, false, false, false, "a"]`	Failed

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

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