1b570d9886
On windows AudioRegionEditor d'tor never returns, stalling or crashing in pthread_join() after pthread_cancel(). Crashes happen if two thread pools with the same name exist. (but since the thread has no event loop, no pool is needed) After showing Region Properties any operation that would close the dialog will either cause the application to hang indefinitely or terminate. This also consolidates code: CrossThreadChannel works on windows these days
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