e.g. when debugging UITest_writer_tests2 it gets stuck when the uitest
invokes dialogs

Change-Id: I8276a8d7e885be5f47309beeec1f4c3c9d12ee32
Reviewed-on: https://gerrit.libreoffice.org/66002
Tested-by: Jenkins
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>