FA-35914 / Tab interfaces / Member archive

Detach window geometry: horizontal anchor · case 04

The tab workspace reports an incorrect horizontal anchor.

Member previewVariant 4 · 3 implementations · 7 checks per implementation

Case contract

Detach a tab into a new window at pointer minus drag anchor, clamp within work area, copy zoom, assign new window ownership and keep original document identity.

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	`[1800, 1152, "w2", "d", 500, false]`	`[1600, 1152, "w2", "d", 500, false]`	Failed

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

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