Try SDL_UDEV_deviceclass to detect joysticks even if in a container (pull request for main) #8745
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The udev container issue is mostly to do with device notifications and netlink. The device classification stuff just pokes file in /sys and /run/udev. Doesn't hurt to try it first for classifying joysticks and then fall to the guess heuristics if it fails.
@slouken this is #8645 cherry picked for main. I was unable to test it beyond comparing the diffs and just verifying it builds okay as the sdl-jtest program does not build against head.