[MacPorts] #46956: base should keep track of explicitly requested variants on install and only preserve those on upgrade

[MacPorts]

#46956: base should keep track of explicitly requested variants on install and only
preserve those on upgrade
--------------------------+----------------------------
  Reporter:  neverpanic   |      Owner:  neverpanic
      Type:  enhancement  |     Status:  accepted
  Priority:  Normal       |  Milestone:  MacPorts 2.6.0
 Component:  base         |    Version:  2.3.3
Resolution:               |   Keywords:
      Port:               |
--------------------------+----------------------------
Changes (by neverpanic):

 * owner:  macports-tickets@… => neverpanic
 * status:  new => accepted


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Ticket URL: <https://trac.macports.org/ticket/46956#comment:8>
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