src/vs/editor/common/config/fontInfo.ts/BareFontInfo/_wrapInQuotes
class BareFontInfo:	private static _wrapInQuotes(fontFamily: string): string {
		if (/[,"']/.test(fontFamily)) {
			// Looks like the font family might be already escaped
			return fontFamily;
		}
		if (/[+ ]/.test(fontFamily)) {
			// Wrap a font family using + or <space> with quotes
			return `"${fontFamily}"`;
		}
		return fontFamily;
	}