title: GridLayout’s rowOrderPreserved and columnOrderPreserved
body: <p>Can someone please explain  what <code>GridLayout</code>’s <code>rowOrderPreserved</code> and <code>columnOrderPreserved</code> mean?</p>
  
  <p>I don't understand the docs. What is the difference between setting the value to true or false. An illustration wil be very helpful.</p>