FA-38483 / Tree accessibility / Member archive

Virtual tree sibling metadata: Virtual row index drops the offscreen prefix · case 03

Virtual row index drops the offscreen prefix produces the wrong hierarchical widget state in a regression fixture.

Member previewVariant 3 · 3 implementations · 6 checks per implementation

Case contract

Rows carry id,parent,logical sibling index,known sibling count,depth. The viewport must expose global sibling positions and counts, one-based depth, root ownership, expandable state only for branches, and stable identity independent of recycled slots.

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
branch	`[6, 11, 4, "p", true, true, true, "tree:b", 2, true]`	`[6, 11, 4, "p", true, true, true, "tree:b", 11, true]`	Failed

MEMBER ARCHIVE

The complete case is available to members.

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

Member access is invitation-based. Sign in with your invited account to inspect the sources.