wp-includes/Text/Diff/Renderer.php:222$lines function _context($lines) { return $this->_lines($lines, ' '); }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.