In two completely independently developed projects (a PyQt application at work, not developed by me, and a C++ Qt application I'm working on as a side project), I'm seeing dropdown rendering errors. First, here's what the render error looks like:
Docker QT Rendering Error
Both applications run in Docker (with your typical X11 socket volume-mount for GUI passthru), both rendering errors present identically and only periodically. My side project (the one in the image) seems to always present the error the first time I start my program after I start the Docker container, but each time after that, the list renders correctly. For the work application (which is more complex than what I have pictured here), the dropdown list that doesn't get rendered correctly changes often and seems to sometimes be triggered by resizing/maximizing the window, but isn't repeatable.
I'm running on qtdeclarative5-dev on Ubuntu 18. The work application is running on PyQt5 from PyPI.
This problem is likely related to the question here Qt app UI elements randomly rendered as blank/black in Docker but that question went unanswered unfortunately.
