FA-36490 / Tab interfaces / Member archive

Tab decoration measurement: dirty footprint · case 05

The tab workspace reports an incorrect dirty footprint.

Member previewVariant 5 · 3 implementations · 6 checks per implementation

Case contract

Tab label layout reserves distinct icon, dirty marker, close button and padding footprints before truncating the title; absent decorations consume no width.

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	`[100, 0, 110, 80, 360, true]`	`[100, 50, 110, 80, 360, true]`	Failed

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

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