Also, improve detection algorithm by replacing the limit
of 20 lines with a time limit of 500ms.
Change-Id: Iac519b6ebe675b91ce84b900646d9d320ea9ddc1
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/165905
Reviewed-by: Andras Timar <andras.timar@collabora.com>
Tested-by: Jenkins