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children_kill_cb() is racey. One obvious problem is that process_close_handles() is *queued* by on_process_exit(), so when children_kill_cb() is invoked, the dead process might still be in the `loop->children` list. If the OS already reclaimed the dead PID, Nvim may try to SIGKILL it. Avoid that by checking `proc->status`. Vim doesn't have this problem because it doesn't attempt to kill processes that ignored SIGTERM after a timeout. closes #8269