FA-36018 / Tab interfaces / Member archive

Pin group interaction: remaining group count · case 03

The tab workspace reports an incorrect remaining group count.

Member previewVariant 3 · 3 implementations · 6 checks per implementation

Case contract

Pinning a tab removes it from its group, moves it behind existing pins, shrinks group count and dissolves empty group headers while keeping selection.

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	`[["a"], ["p", "b"], 1, 2, false, "a"]`	`[["a"], ["p", "b"], 1, 1, false, "a"]`	Failed

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