[Bugs] #2217 UNSP: Actvities fail to start when no connection is available

[Sugar Labs Bugs]

#2217: Actvities fail to start when no connection is available
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    Reporter:  sascha_silbe               |          Owner:  tomeu            
        Type:  defect                     |         Status:  new              
    Priority:  Unspecified by Maintainer  |      Milestone:  0.90             
   Component:  sugar                      |        Version:  Git as of bugdate
    Severity:  Blocker                    |       Keywords:                   
Distribution:                             |   Status_field:  New              
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Comment(by tomeu):

 Replying to [comment:3 sascha_silbe]:
 > I've {{{sugar.logger.trace()}}}d {{{__name_owner_changed_cb()}}} for
 testing, BTW (it shows up in shell.log).
 > We're getting notified of quite a few changes. Is there anything we can
 do to filter these out on the bus level already?

 For the one in buddy.py no because signal filtering works only by matching
 full strings. But the one in shell.py could definitively filter by service
 name: #2308

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Ticket URL: <http://bugs.sugarlabs.org/ticket/2217#comment:8>
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