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Virtualized row visibility: Overscan fails to include rows after the viewport · case 04

Overscan fails to include rows after the viewport.

Member previewVariant 4 · 3 implementations · 11 checks per implementation

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 fixture

This sample comes from the broken implementation of a controlled reproducer.

Boundary fixtureActualExpectedOutcome
overscan[1, 2][1, 2, 3]Failed

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

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