[Bugs] #2360 UNSP: ActivityButton doesn't get garbage collected

[Sugar Labs Bugs]

#2360: ActivityButton doesn't get garbage collected
------------------------------------------+---------------------------------
    Reporter:  sascha_silbe               |          Owner:  tomeu            
        Type:  defect                     |         Status:  new              
    Priority:  Unspecified by Maintainer  |      Milestone:  0.90             
   Component:  sugar                      |        Version:  Git as of bugdate
    Severity:  Minor                      |       Keywords:                   
Distribution:                             |   Status_field:  New              
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 {{{jarabe.frame.activitiestray.ActivityButton}}} instances don't get
 garbage-collected after they have been removed in
 {{{jarabe.frame.activitiestray.ActivitiesTray.__activity_removed_cb()}}}.
 Some {{{jarabe.frame.frameinvoker.FrameWidgetInvoker}}} (derived from
 {{{sugar.graphics.palettewindow.WidgetInvoker}}} using the compatibility
 name {{{sugar.graphics.palette.WidgetInvoker}}}) still holds a reference
 of it as {{{self.parent}}}.

 Since I don't know how all the palette magic works, I'll leave it for
 someone else to fix.

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Ticket URL: <http://bugs.sugarlabs.org/ticket/2360>
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