src/vs/base/browser/ui/centered/centeredViewLayout.ts/CenteredViewLayout/boundarySashes
class CenteredViewLayout:	set boundarySashes(boundarySashes: IBoundarySashes) {
		this._boundarySashes = boundarySashes;

		if (!this.splitView) {
			return;
		}

		this.splitView.orthogonalStartSash = boundarySashes.top;
		this.splitView.orthogonalEndSash = boundarySashes.bottom;
	}