FA-39094 / Tree accessibility / Member archive
Virtual tree active-descendant lease: Logical active row is not repaired after branch collapse · case 04
Logical active row is not repaired after branch collapse produces the wrong hierarchical widget state in a regression fixture.
Case contract
A virtualized active row keeps its identity while offscreen. Expose an active descendant only after a matching mount generation acknowledges the row; scrolling requests mount without changing selection. A recycled slot must not satisfy an old lease. Collapse repairs the logical active row to the closest visible ancestor before mounting.
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 fixtureThis sample comes from the broken implementation of a controlled reproducer.
| Boundary fixture | Actual | Expected | Outcome |
|---|---|---|---|
| collapse | ["b", "tree:b", null, null, ["a"], null, ["b"]] | ["a", "tree:a", null, null, ["a"], null, ["a"]] | Failed |
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This record includes three runnable implementations, regression fixtures, execution results, and source hashes.
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