Wikimedia Bugzilla is closed!

The tr with a th element from a nested table in a th element of a sortable table gets moved to the outer table:

{| class="wikitable sortable"
|-
! THEAD1
|-
!
{|
|-
! THEAD2
|}
|-
| TBODY
|}

is converted to

<table class="wikitable sortable jquery-tablesorter">
 <thead>
  <tr>
   <th class="headerSort" title="Aufsteigend sortieren">THEAD1</th>
  </tr>
  <tr>
   <th>
    <table>
     <tbody>
     </tbody>
    </table>
   </th>
  </tr>
  <tr>
   <th>THEAD2</th>
  </tr>
 </thead>
 <tbody>
  <tr>
   <td>TBODY</td>
  </tr>
 </tbody>
 <tfoot></tfoot>
</table>

expeced result:

<table class="wikitable sortable jquery-tablesorter">
 <thead>
  <tr>
   <th class="headerSort" title="Aufsteigend sortieren">THEAD1</th>
  </tr>
  <tr>
   <th>
    <table>
     <tbody>
      <tr>
       <th>THEAD2</th>
      </tr>
     </tbody>
    </table>
   </th>
  </tr>
 </thead>
 <tbody>
  <tr>
   <td>TBODY</td>
  </tr>
 </tbody>
</table>