title: Angular Material MatSort disabled columns cannot be dragged
body: <p>Using Angular Material, I have a Material table with MatSort to allow sorting of some (but not all) columns and drag and drop on the column headers to allow changing column order.</p>
  <p>The problem is: <strong>columns for which sorting is disabled, cannot be dragged</strong></p>
  <p>The problem can be reproduced in <a href="https://stackblitz.com/edit/angular-mat-table-columns-draggable?file=src%2Fapp%2Fapp.component.html" rel="nofollow noreferrer">https://stackblitz.com/edit/angular-mat-table-columns-draggable?file=src%2Fapp%2Fapp.component.html</a> by adding the following line to </p>
  <pre><code>[disabled]=&quot;i%2==0&quot;
  </code></pre>
  <p>Now only the second and the fourth column can be dragged.</p>