FA-36394 / Tab interfaces / Member archive

Dock target regions: center join region · case 04

The tab workspace reports an incorrect center join region.

Member previewVariant 4 · 3 implementations · 8 checks per implementation

Case contract

A dropped tab creates a new ungrouped pane only in an edge docking zone; center targets join the destination group. Center drops into the source pane are no-ops. Corners resolve to the nearest normalized edge.

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 3	`[true, "right", "top", "vertical", false, null]`	`[false, "right", "top", "vertical", false, null]`	Failed

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