Comment 40 for bug 1252655

I stand corrected, it also happens with copy&paste. But I got a bit further to a solution: Indeed, this seems to be a timing problem.

http://git.xfce.org/xfce/thunar/tree/thunar/thunar-job.c#n573
Adding sleep (1); before this line solves the problem for me:

--
      /* emit the "new-files" signal */
      sleep (1);
      exo_job_emit (EXO_JOB (job), job_signals[NEW_FILES], 0, file_list);
--

The move event is also properly triggered, with no "(null)" in other_path.