macOS: SDL_SyncWindow can time out if the app supports live resize

[slime73]

I recently added live resize support to my program (by running the game loop in an SDL event watcher when SDL_EVENT_WINDOW_EXPOSED happens).

Doing so has caused my macOS Github Action CI tests to intermittently fail in some window tests because SDL_SyncWindow is hitting the internal timeout before some state transitions actually complete. Here's an example (near the bottom of the 'Run Test Suite' part of the log) https://github.com/slime73/love-experiments/actions/runs/13226467292/job/36917969548

I haven't been able to reproduce the problem on my own Mac, I'm guessing because it's much faster than a github runner. Assuming an app doesn't do anything drastically slow in its game loop, is there something in SDL that should change to make SyncWindow more reliable in this situation? Or something my own code should change?