How to remove _wp_http_referer from URL when using WP_List_table?

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As the last commenter on that Q suggested, you should probably check for actions, remove the query args and redirect. Something like:

$doaction = $wp_list_table->current_action();
if ( $doaction && isset( $_REQUEST['SOMEVAR'] ) ) {
    // do stuff
} elseif ( ! empty( $_GET['_wp_http_referer'] ) ) {
    wp_redirect( remove_query_arg( array( '_wp_http_referer', '_wpnonce' ), stripslashes( $_SERVER['REQUEST_URI'] ) ) );
    exit;
}

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