FA-39160 / Tree accessibility / Member archive

Treegrid rectangular cell range: Column endpoint or reversed range is dropped · case 05

Column endpoint or reversed range is dropped produces the wrong hierarchical widget state in a regression fixture.

Member previewVariant 5 · 3 implementations · 6 checks per implementation

Case contract

A cell range spans visible rows within the anchor sibling group and visible columns; collapsed descendants and other sibling groups are excluded. Disabled rows and protected cells are skipped. Range serialization follows row-major visible order; additive range preserves prior cells.

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
reverse cols	`[[], "d:name", ["a", "y"]]`	`[["a:name", "a:x", "a:y", "c:name", "c:y", "d:name", "d:x", "d:y"], "d:name", ["a", "y"]]`	Failed

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

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