Previously it would always go back to an empty form, but there is no
reason not to pre-populate the dropdown on the main search site with the
selected list.
Per complaint from Erik Rijkers
<tr class="lastrow">
<td class="colFirst"></td>
<td>(enter a message-id to go directly to that message)</td>
- <td class="colLast" align="right"><a href="https://www.postgresql.org/search/?m=1">Advanced Search</a></td>
+ <td class="colLast" align="right"><a href="https://www.postgresql.org/search/?m=1{%if searchform_list%}&l={{searchform_list}}{%endif%}">Advanced Search</a></td>
</tr>
</table>
</div>