FA-8702 / Overlay interactions / Member archive
Overlay dismissal stack: Unmounting one layer retains only the removed layer · case 02
Unmounting one layer retains only the removed layer.
Case contract
Only the topmost overlay handles Escape/outside policy; inside descendants are exempt; explicit unmount removes only its identity.
Why this case matters
A deterministic model of overlay dismissal stack; this isolates one interface invariant without requiring a browser.
One recorded failure
Sample boundary fixtureThis sample comes from the broken implementation of a controlled reproducer.
| Boundary fixture | Actual | Expected | Outcome |
|---|---|---|---|
| remove | [{"escape": true, "id": "a", "inside": ["a"], "outside": true}] | [{"escape": true, "id": "b", "inside": ["b"], "outside": true}] | Failed |
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