wp-includes/Text/Diff/Renderer.php:237$orig$final function _changed($orig, $final) { return $this->_deleted($orig) . "---\n" . $this->_added($final); }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.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.