After5c9ba1f47d, the failures on Jenkins (see21191d0d89) made it apparent that (at least some of) Jenkins builds also run in RDP sessions. Since the tests excluded in commit9c6142ec26never failed in Jenkins builds before, it is wrong to exclude all those tests in all RDP sessions: our CI would not test those on Windows. In the meanwhile, I discovered that the system that failed the tests actually had 16-bit color depth, despite RDP being configured to use 32-bit colors; that was the reason why the colors were modified on roundtrip. So it is better to test the actual problem to exclude tests. This reimplements the check that was introduced in commit9c6142ec26to test default virtual device color depth. Change-Id: I329a3e2d8eca21732c77dcacf15394d1246b2e18 Reviewed-on: https://gerrit.libreoffice.org/c/core/+/113460 Tested-by: Mike Kaganski <mike.kaganski@collabora.com> Reviewed-by: Mike Kaganski <mike.kaganski@collabora.com>