[Bugs] #3661 Jukebox UNSP: Jukebox should always save a playlist with references to media

[Sugar Labs Bugs]

#3661: Jukebox should always save a playlist with references to media
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    Reporter:  manuq                      |          Owner:  manuq      
        Type:  defect                     |         Status:  new        
    Priority:  Unspecified by Maintainer  |      Milestone:  0.96       
   Component:  Jukebox                    |        Version:  Unspecified
    Severity:  Unspecified                |       Keywords:  12.1.0     
Distribution:  Unspecified                |   Status_field:  Unconfirmed
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Description changed by manuq:

Old description:

> Current behaviour is to save the first media in the journal, and save the
> playlist when more media is added to the playlist.

New description:

 Current playlist handling is a bit inconsistent, so the hopefully clear
 testcases below would help as specification.  Journal current behaviour is
 to copy to the Journal a file that is stored in an external media, so
 Jukebox can't avoid that copy in today's Journal.

 TestCases:

  * start Jukebox from scratch, close it
  * an empty playlist is stored, type: audio/x-mpegurl, size: empty,
   title: "Jukebox Activity"

 Currently, the entry added to the journal is type: unknown.

  * start Jukebox from scratch, add one media, close
  * a playlist is stored, type: audio/x-mpegurl

  * start Jukebox from scratch, add more than one media, close
  * a playlist is stored, type: audio/x-mpegurl

 Currently, two entries are added to the journal.  One is type:
 audio/x-mpegurl, title: "Jukebox playlist".  The other is type:
 unknown, size: empty

  * start playlist (type: audio/x-mpegurl) with Jukebox, add one media,
   close
  * a playlist is stored, type: audio/x-mpegurl

  * start Jukebox from media inside journal, close
  * a playlist is stored, type: audio/x-mpegurl, title: "Jukebox
   playlist"

  * start Jukebox from media outside journal (ie Documents folder), close
  * the media is copied to the journal (as per Journal current behaviour
   [1])
  * also a playlist is stored, type: audio/x-mpegurl, title: "Jukebox
   playlist"

 [1] sugar/src/jarabe/journal/misc.py resume() function

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Ticket URL: <http://bugs.sugarlabs.org/ticket/3661#comment:3>
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