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33f3c03dae
Prior to this change, a function with an on-job-exit event handler must be added with the pgid of the job. But sometimes the pgid of the job is fish itself (if job control is disabled) and the previous commit made last_pid an actual pid from the job, instead of its pgroup. Switch on-job-exit to accept any pid from the job (except fish itself). This allows it to be used directly with $last_pid, except that it now works if job control is off. This is implemented by "resolving" the pid to the internal job id at the point the event handler is added. Also switch to passing the last pid of the job, rather than its pgroup. This aligns better with $last_pid.