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I notice we have a test that throws an exception if Children.MUTEX is entered while in ProjectManager.MUTEX. This sort of test is a good thing. I wonder if it would be worthwhile also to test Thread.holdsLock (someComponent.getTreeLock()), since this is a potent source of deadlocks (possibly also in Children.MUTEX?) getTreeLock() returns a static Object; the method is not static but it would be simple to create a component and hold the resulting value.
Change of default owner.
This old bug may not be relevant anymore. If you can still reproduce it in 8.2 development builds please reopen this issue. Thanks for your cooperation, NetBeans IDE 8.2 Release Boss