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In fast debugger. Likely it never worked. But kind of supposed. So filling as a bug. The problem is that the NetBeans code checks whether thread is *suspended*, but there will never be more then one thread suspended by the backend, since it 'cheats': thread_switch = set_step_next + resume Not sure about TM, setting for 'future' now.
*** Issue 174017 has been marked as a duplicate of this issue. ***