src/vs/base/browser/ui/grid/gridview.ts/toAbsoluteBoundarySashes
function toAbsoluteBoundarySashes(sashes: IRelativeBoundarySashes, orientation: Orientation): IBoundarySashes {
	if (orientation === Orientation.HORIZONTAL) {
		return { left: sashes.start, right: sashes.end, top: sashes.orthogonalStart, bottom: sashes.orthogonalEnd };
	} else {
		return { top: sashes.start, bottom: sashes.end, left: sashes.orthogonalStart, right: sashes.orthogonalEnd };
	}
}