FA-39815 / Tree accessibility / Member archive
Bounded accessible branch expansion eviction: Expansion budget stop compares count instead of weights or misses equality · case 05
Expansion budget stop compares count instead of weights or misses equality produces the wrong hierarchical widget state in a regression fixture.
Case contract
Expanded branches have positive weights, distinct recency ages, and a positive budget. Opening a target requires its entire ancestor path. Evict oldest expandable subtrees atomically until within budget, never evicting a subtree containing a pinned branch or requested path. If the required path cannot fit, reject without changing expansion or recency.
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 |
|---|---|---|---|
| older unrelated root | [["a", "b", "r"], ["q", "c"], true, 6, {"a": 15, "b": 5, "c": 4, "leaf": 5, "q": 0, "r": 6}] | [["a", "b", "c", "r"], ["q"], true, 7, {"a": 15, "b": 5, "c": 4, "leaf": 5, "q": 0, "r": 6}] | Failed |
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