Consider adding new unit test cases to improve the test coverage for example here:
http://ci-files02-hki.intra.qt.io/packages/jenkins/qtsaferenderer/nightly/html/1.2/2021-02-20.00.01.01/QSR_nightly_Linux_Autotest_Multiple_Condition_Code_Coverage_200221_html/source_32.html#line84