Overrides DiffFormatter::_block_header
function _block_header($xbeg, $xlen, $ybeg, $ylen) {
return array(
array(
'data' => theme('diff_header_line', array(
'lineno' => $xbeg + $this->line_stats['offset']['x'],
)),
'colspan' => 2,
),
array(
'data' => theme('diff_header_line', array(
'lineno' => $ybeg + $this->line_stats['offset']['y'],
)),
'colspan' => 2,
),
);
}