src/vs/workbench/browser/parts/editor/sideBySideEditor.ts/SideBySideEditor/layoutPane
class SideBySideEditor:	private layoutPane(pane: EditorPane | undefined, size: number): void {
		pane?.layout(this.orientation === Orientation.HORIZONTAL ? new Dimension(size, this.dimension.height) : new Dimension(this.dimension.width, size));
	}