title: QTableView setSortingEnabled is forcing sortBycolumn
body: <p>I am using a <code>QTableView</code> and when I enable sorting using the <a href="http://doc.qt.io/qt-5/qtableview.html#sortingEnabled-prop" rel="nofollow noreferrer"><code>setSortingEnabled</code></a> there is an immediate call to the <code>sortByColumn()</code>, but I do not want this as this sorts my table by default 1st column.</p>
  
  <ul>
  <li>I want just to enable sorting and not to force sorting when enabling</li>
  <li>Is there a way to avoid the <code>sortByColumn()</code> call?</li>
  <li>Or how can I overwrite the <code>sortByColumn()</code> method and prevent the sorting there?</li>
  </ul>