FA-36748 / Tab interfaces / Member archive

Per tab location history: sibling history isolation · case 03

The tab workspace reports an incorrect sibling history isolation.

Member previewVariant 3 · 3 implementations · 6 checks per implementation

Case contract

A document tab maintains location history independent of sibling views. Navigating after Back truncates its forward branch, caps history and restores exact cursor offsets.

Why this case matters

Offline tab/panel workspace behavior; no browser or desktop framework is emulated.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
workspace regression 0	`[[10, 20], [10, 20, 150], [10, 20, 150], 0, 10, [10, 20, 30, 40, "background0", "background1"]]`	`[[10, 20], [10, 20, 150], [10, 20, 150], 0, 10, [3, 6]]`	Failed

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