wp-includes/Text/Diff/Renderer/inline.php:93$xbeg$xlen$ybeg$ylen function _blockHeader($xbeg, $xlen, $ybeg, $ylen) { return $this->_block_header; }Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/Text/Diff/Renderer/inline.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.