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The testing-stable container image no longer includes pyvirtualdisplay due to a change that made it unnecessary for develop that also affected the stable image. Instead of reinstalling pyvirtualdisplay this just wraps the entire pytest execution in xvfb-run, which has mostly the same effect. This is a bandaid to fix the stable CI until all of the recent changes to the tests are backported from develop to stable.
Fixes #2199.