[Bugs] #1358 UNSP: Changes to a Journal entries metadata are wiped if edited while Activity entry is currently instantiated

[Sugar Labs Bugs]

#1358: Changes to a Journal entries metadata are wiped if edited while Activity
entry is currently instantiated
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    Reporter:  garycmartin                |          Owner:  erikos  
        Type:  defect                     |         Status:  assigned
    Priority:  Unspecified by Maintainer  |      Milestone:  0.88    
   Component:  sugar-toolkit              |        Version:  0.82.x  
    Severity:  Blocker                    |       Keywords:  r?      
Distribution:  Unspecified                |   Status_field:  Assigned
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Comment(by erikos):

 The above patch lets the DSObject listen for the updates to the object. To
 only listen for changes to a specific object is done by adding the arg0
 argument to the dbus connect call. The DSMetadata associated with that
 object is then updated. On property changes in the DSMetadata a gobject
 signal is emmitted, on which the activity base class is already listening
 on (at the moment it only listens for the title to change).

 The patch adds the "add_update_listener()" since when creating a new
 DSObject the ID is None. The ID is only set after datastore entry is
 created. Actaully one could so that as well write call in the datastore.py

 One interesting thing about the patch is, that it can be easily back
 ported to 0.84, or even 0.82.

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Ticket URL: <http://bugs.sugarlabs.org/ticket/1358#comment:5>
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