[MacPorts] #26028: Add feature to show changes between port versions

[MacPorts]

#26028: Add feature to show changes between port versions
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 Reporter:  sewebster@…          |       Owner:  macports-tickets@…                   
     Type:  enhancement          |      Status:  new                                  
 Priority:  Low                  |   Milestone:                                       
Component:  base                 |     Version:                                       
 Keywords:                       |        Port:                                       
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Comment(by sewebster@…):

 I guess an easier way for this to work from the user perspective would be
 to have a command like {{{port diff portname}}} and just compare the
 installed version with the available version.

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Ticket URL: <http://trac.macports.org/ticket/26028#comment:1>
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