WP_Comments_List_Table::floated_admin_avatar( string $name, int $comment_id )

Source

File: wp-admin/includes/class-wp-comments-list-table.php

public function floated_admin_avatar( $name, $comment_id ) {
		$comment = get_comment( $comment_id );
		$avatar  = get_avatar( $comment, 32, 'mystery' );
		return "$avatar $name";
	}