[MacPorts] #40687: bash-completion: port load and port unload should only complete installed port names

[MacPorts]

#40687: bash-completion: port load and port unload should only complete installed
port names
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 Reporter:  ryandesign@…  |      Owner:  raimue@…
     Type:  enhancement   |     Status:  new
 Priority:  Normal        |  Milestone:
Component:  ports         |    Version:
 Keywords:                |       Port:  bash-completion
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 When I type {{{port load my}}} and press tab twice, I see the names of all
 ports whose names begin with "my" regardless of whether I've installed
 them. It should only show me the ports I've installed, because you can't
 load or unload a port that isn't installed.

 Ideally it would only show those ports that actually have launchd plists
 but I don't expect bash-completion to be able to know that.

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Ticket URL: <https://trac.macports.org/ticket/40687>
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