When paint hits a blue screen during integration tests, it looks like a timeout

Here's an example: https://app.circleci.com/pipelines/github/LLK/scratch-gui/5308/workflows/34be8130-7ad1-40c1-be8f-c28aa9df5616/jobs/26403

Ideally it should print the stack trace of the error rather than timing out, which is unhelpful