[Lazarus] Thread finalization

[cobines]

Your thread calls OnTerminate via Synchronize and waits until the
callback finishes. In the callback you call Thread.Destroy which waits
until the thread finishes. It is a deadlock.

Other than using FreeOnTerminate=True, maybe periodically check from
the main thread the status of the thread. If it is finished then
destroy, but don't do it from OnTerminate.

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cobines