[MacPorts] #70514: port activate lists port instances twice

[MacPorts]

#70514: port activate lists port instances twice
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 Reporter:  fhgwright  |      Owner:  (none)
     Type:  defect     |     Status:  new
 Priority:  Normal     |  Milestone:
Component:  base       |    Version:  2.10.0
 Keywords:             |       Port:
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 Now, when `port activate` lists the installed instances to choose from, it
 first lists them all with no selection numbers, and then lists them again
 with the selection numbers.  The first of these is obviously pointless.
 I'm pretty sure this misbehavior is new in 2.10.0.

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Ticket URL: <https://trac.macports.org/ticket/70514>
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