[MacPorts] #26477: kdenlive: update to new upstream version 0.7.8

[MacPorts]

#26477: kdenlive: update to new upstream version 0.7.8
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 Reporter:  dan@…                |       Owner:  macports-tickets@…                   
     Type:  update               |      Status:  new                                  
 Priority:  Normal               |   Milestone:                                       
Component:  ports                |     Version:                                       
 Keywords:  haspatch maintainer  |        Port:  kdenlive                             
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Comment(by dan@…):

 Kdenlive is not going to make a new release just to fix this, so I have to
 learn how to make a patch for use with ports. This did not fail for me
 because it has been a while since I updated Qt and KDE.

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Ticket URL: <https://trac.macports.org/ticket/26477#comment:3>
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