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Virtualized row visibility: A row ending exactly at the viewport top remains visible · case 02
A row ending exactly at the viewport top remains visible.
Case contract
Rows overlap a half-open viewport using cumulative measured heights; overscan expands both sides and clamps to valid row indices.
Why this case matters
A deterministic model of virtualized row visibility; 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 |
|---|---|---|---|
| top edge | [0, 1] | [1] | Failed |
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