use Sort::Key::Multi qw(i3_keysort);
  # i3_keysort => sorter sub that expects
  #               three integer keys

print join "\n",
    map "$_->[0] $_->[1] $_->[2]",
    i3_keysort {
        my ($type, $item, $index) = @$_;
        my ($ix1, $ix2) = $index =~ /^(\d+)\.(\d+)$/;
        my $flag = flagValue($tagTypes{$item}[2]);
        $flag = -$flag if $type eq 'off';

        ($ix1, $ix2, $flag)
    } @tagIndexes;