wp-admin/includes/media.php:1363Retrieves the post non-image attachment fields to edit form fields.
$form_fieldsarray$postWP_Postarrayfunction media_post_single_attachment_fields_to_edit( $form_fields, $post ) { unset( $form_fields['image_url'] ); return $form_fields;}Introduced in 2.8.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-admin/includes/media.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.