FA-8785 / Viewport layout / Member archive

Split-pane divider allocation: Divider width is counted as usable pane area · case 05

Divider width is counted as usable pane area.

Member previewVariant 5 · 3 implementations · 12 checks per implementation

Case contract

Subtract divider from total; honor both minimums when feasible; otherwise share available width in proportion to minima; panes sum to available space.

Why this case matters

A deterministic model of split-pane divider allocation; this isolates one interface invariant without requiring a browser.

One recorded failure

Sample boundary fixture

This sample comes from the broken implementation of a controlled reproducer.

Boundary fixture	Actual	Expected	Outcome
normal	`[40, 70]`	`[40, 60]`	Failed

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

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