rem: void FilterEditDialog::updateFilterList()
add: void FilterEdit::updateFilterList()
context: void FilterEditDialog::updateFilterList(){  mSelectionCombo->clear();  CalFilter *filter = mFilters->first();  if ( !filter ) {    enableButtonOK( false );    enableButtonApply( false );  } else {    while( filter ) {      mSelectionCombo->insertItem( filter->name() );      filter = mFilters->next();    }    CalFilter *f = mFilters->at( mSelectionCombo->currentItem() );    if ( f ) readFilter( f );    enableButtonOK( true );    enableButtonApply( true );  }  mRemoveButton->setEnabled( mFilters->count() > 1 );}