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            $destRow = $current->{'rowTop'} + $row - 2;

...
                  {
                  $destRow = $screen->{'height'};
                  }

            $backAtt[$destRow][$destCol] = 
                 $current->{'backAtt'}[$row - 1][$col - 1];
...

            substr($backTxt[$destRow], $destCol, 1) = 
                 substr($current->{'backTxt'}[$row - 1],$col - 1, 1);

sub makeFullBackBuffer {
    my ($self) = @_;
...
    }
    return \( @backAtt, @backTxt );
}