src/vs/editor/contrib/gotoSymbol/peek/referencesWidget.ts/LayoutData/fromJSON
class LayoutData:	static fromJSON(raw: string): LayoutData {
		let ratio: number | undefined;
		let heightInLines: number | undefined;
		try {
			const data = <LayoutData>JSON.parse(raw);
			ratio = data.ratio;
			heightInLines = data.heightInLines;
		} catch {
			//
		}
		return {
			ratio: ratio || 0.7,
			heightInLines: heightInLines || 18
		};
	}