[MacPorts] #54386: variants set with default_variant don't propagate the same way as variants set by the user do.

[MacPorts]

#54386: variants set with default_variant don't propagate the same way as variants
set by the user do.
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  Reporter:  RJVB    |      Owner:
      Type:  defect  |     Status:  new
  Priority:  Normal  |  Milestone:
 Component:  base    |    Version:
Resolution:          |   Keywords:
      Port:          |
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Comment (by RJVB):

 I'd be curious to know why this is the intended behaviour, which feels
 like an inconsistency and probably requires additional processing.

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Ticket URL: <https://trac.macports.org/ticket/54386#comment:4>
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