title: How to check if given font family is a Composite font?
body: <p>We can enumerate over the fonts available on system using Fonts.SystemFontFamilies.</p>
  
  <ol>
  <li>How can I distinguish between composite fonts and plain-font?</li>
  <li>How can I get the FontFamilies used in a composite font?</li>
  </ol>
  
  <p>I tried FontFamily.FamilyTypefaces, but it wasn't helpful.</p>
  
  <p>Thanks</p>