FA-36498 / Tab interfaces / Member archive

Tab decoration measurement: double padding · case 03

The tab workspace reports an incorrect double padding.

Member previewVariant 3 · 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	`[60, 30, 66, 24, 216, true]`	`[60, 30, 66, 48, 216, true]`	Failed

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

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