FA-35949 / Tab interfaces / Member archive

Tab group collapse: header count · case 04

The tab workspace reports an incorrect header count.

Member previewVariant 4 · 3 implementations · 6 checks per implementation

Case contract

Collapsed tab groups display only a header and active member placeholder; preserve membership, count dirty documents and expand before revealing an inactive member.

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	`[["b"], 1, 2, "b", true, ["a", "b", "c", "extra0", "extra1", "extra2"]]`	`[["b"], 6, 2, "b", true, ["a", "b", "c", "extra0", "extra1", "extra2"]]`	Failed

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