FA-36199 / Tab interfaces / Member archive

Multi tab drag: drag anchor retention · case 04

The tab workspace reports an incorrect drag anchor retention.

Member previewVariant 4 · 3 implementations · 6 checks per implementation

Case contract

Dragging a selected set keeps its visual order, rebases drop boundary by every moved item before it, preserves anchor view and leaves unselected tabs ordered.

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", "d"], ["a", "c", "e", "background0", "background1", "background2"], 3, "b", 1, [3, 4]]`	`[["b", "d"], ["a", "c", "e", "background0", "background1", "background2"], 3, "d", 1, [3, 4]]`	Failed

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

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