[Bugs] #1786 UNSP: cannot launch activity if multiple data store entries have the same activity_id

[Sugar Labs Bugs]

#1786: cannot launch activity if multiple data store entries have the same
activity_id
------------------------------------------+---------------------------------
    Reporter:  sascha_silbe               |          Owner:  erikos           
        Type:  defect                     |         Status:  new              
    Priority:  Unspecified by Maintainer  |      Milestone:  0.88             
   Component:  sugar-toolkit              |        Version:  Git as of bugdate
    Severity:  Unspecified                |       Keywords:                   
Distribution:  Unspecified                |   Status_field:  New              
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 Happened to me during testing the version support prototype; I am too lazy
 to reproduce it on the master branch right now but it should be obvious
 enough anyway.
 {{{sugar.activity.activityfactory.ActivityCreationHandler}} has been
 changed to use {{{sugar.datastore.datastore}}} instead of interfacing with
 directly via D-Bus. A part of {{{_find_object_reply_handler()}}} was
 missed during the conversion:

 {{{
     def _find_object_reply_handler(self, jobjects, count):
         if count > 0:
             if count > 1:
                 logging.debug("Multiple objects has the same
 activity_id.")
             self._handle.object_id = jobjects[0]['uid']
         self._launch_activity()
 }}}

 {{{jobjects}}} is a list os {{{DSObject}}}s now, so we need to to use
 {{{jobjects[0].metadata['uid']}}}.

 I guess the proper fix would be to pass data store object ids ({{{uid}}}
 resp. {{{(tree_id, version_id)}}}) instead of {{{activity_id}}}s.

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Ticket URL: <http://bugs.sugarlabs.org/ticket/1786>
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