wp-admin/includes/class-custom-background.php:610$tabsarrayarray public function filter_upload_tabs( $tabs ) { return $tabs; }Introduced in 3.4.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-admin/includes/class-custom-background.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.