[MacPorts] #71879: Port upgrade doesn't reload startupitems on older macOS versions (was: Port upgrade may fail to reload port)

[MacPorts]

#71879: Port upgrade doesn't reload startupitems on older macOS versions
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  Reporter:  fhgwright  |      Owner:  (none)
      Type:  defect     |     Status:  new
  Priority:  Normal     |  Milestone:
 Component:  base       |    Version:  2.10.5
Resolution:             |   Keywords:
      Port:             |
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Comment (by jmroot):

 IIRC, nobody ever figured out how to make `portstartupitem::loaded` work
 on old OS versions. I forget what the minimum was but it definitely
 doesn't work on 10.6. We of course only want to load startupitems that
 were loaded before the upgrade, so effectively the behaviour is just to
 unload on upgrade when we can't figure out what was loaded (which was
 still an improvement on the previous behaviour of never automatically
 unloading.)

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Ticket URL: <https://trac.macports.org/ticket/71879#comment:3>
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