src/vs/workbench/browser/parts/editor/sideBySideEditor.ts/SideBySideEditor/layout
class SideBySideEditor:	layout(dimension: Dimension): void {
		this.dimension = dimension;

		const splitview = assertIsDefined(this.splitview);
		splitview.layout(this.orientation === Orientation.HORIZONTAL ? dimension.width : dimension.height);
	}