[racket] XNextEvent blocking 'read' in other thread?

Also, both versions seem to suffer a heavy cost of a few seconds of
> initialization compared to the basic XNextEvent version.
>

Hmm, no, that seems to be due to some other problem: to force
synchronization, I need to generate several events at first for the handler
to catch up. There might be some XFlush or XSync or something missing
somewhere.
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