Xpra: Ticket #1965: tests can fail if a display is in use

If a vfb is left running from an aborted or failed test then we may try to start a new one on the same display number and fail.

Detected thanks to r20471. Somewhat related to #1963.

Thu, 20 Sep 2018 04:59:21 GMT - Antoine Martin: status, description changed

Sat, 22 Sep 2018 15:33:00 GMT - Antoine Martin: status changed; resolution set

More test improvements: r20474, r20476, r20492, r20493, r20495

The tests now run without errors again, including on the new buildbot!

The new buildbot also uses nspawn to protect and better isolate the host from the build environment. So failures in one build "chroot" should not caused failures for other distros.

Sat, 23 Jan 2021 05:38:32 GMT - migration script:

this ticket has been moved to: https://github.com/Xpra-org/xpra/issues/1965