Getting wxHaskell to handle UI updates from non-UI threads was a frustrating experience; it's embarassing how long it took me to realise that the solution presented in this StackOverflow answer: http://stackoverflow.com/a/3182588/424978 is probably the only viable one. I've packaged it into a tiny module that provides Gtk2hs-style `postGUIAsync` function: https://github.com/mmakowski/habaz/blob/master/src/Graphics/UI/WX/Async.hs. Is there any interest in incorporating this into wxHaskell proper? It might save other users some head scratching.
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