ugly fix for 0003569
the new filter code in the upcoming release is surely better.

Modified Files:
core/filter_api.php doc/ChangeLog

git-svn-id: http://mantisbt.svn.sourceforge.net/svnroot/mantisbt/trunk@2406 <a class="text" href="/?p=mantisbt.git;a=object;h=f5dc347c">f5dc347c</a>-c33d-0410-90a0-b07cc1902cb9