title: QTableWidget find a row through userdata
body: <p>QTableWidget have a method to search for a row with user data?</p>
  
  <p>Something like:</p>
  
  <pre><code>//set user data
  row-&gt;setData(0, Qt::UserRole, "ID001");
  
  //find row by user data
  int rowIndex = table-&gt;findByData("ID001");
  </code></pre>