FA-37580 / Table interactions / Member archive

Table viewport anchor restoration: column anchor identity · case 05

The table column anchor identity result violates the stipulated table viewport anchor restoration contract.

Member previewVariant 5 · 3 implementations · 9 checks per implementation

Case contract

Restore a table viewport by stable row and column anchors after structural changes. A removed row chooses its next surviving former successor or final row, resets its inset, clamps surviving insets to new sizes, and clamps vertical scroll to the viewport extent.

Why this case matters

An offline table UI model isolates table viewport anchor restoration, including adversarial row/column relationships.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
insert before anchored row	`{"column": "x", "row": "b", "scroll_x": 2, "scroll_y": 14}`	`{"column": "b", "row": "b", "scroll_x": 10, "scroll_y": 14}`	Failed

MEMBER ARCHIVE

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

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