[Bugs] #507 UNSP: Joining shared Activity shifts activity icon by few pixels each time, icons can end up off screen

[SugarLabs Bugs]

#507: Joining shared Activity shifts activity icon by few pixels each time, icons
can end up off screen
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    Reporter:  garycmartin                |          Owner:  tomeu                      
        Type:  defect                     |         Status:  new                        
    Priority:  Unspecified by Maintainer  |      Milestone:  Unspecified by Release Team
   Component:  sugar                      |        Version:  0.84.x                     
    Severity:  Minor                      |       Keywords:                             
Distribution:  Unspecified                |   Status_field:  Unconfimed                 
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 Best explained with a test case:

 - Two Sugar clients attached to a working jabber server so both can see
 each others buddy icon
 - On client A, start chat and share
 - On client B, go to neighbourhood view and join the shared chat activity
 - On client B, switch back to neighbourhood view
 - On client A, switch from chat to to Journal (alt tab is a good way to
 repeat this, can be any other activity you switch to) and then switch back
 to chat again
 - On client B notice that the shared chat activity icon drifts across the
 screen by a few pixels to the right and a few pixels down
 - On client A, repeat switching back and forth between the shared chat and
 another Activity while watching the neighbourhood view on client B
 - Each time client A buddy icon moves back to the shared icon, the
 activity icon will drift right and down by a few pixels

 If the Activity icon started close to the right or bottom edge it may
 disappear off screen. Returning buddy icons will also get vertically
 further and further away from the activity icon so they are no longer even
 near each other. If you run this test with more than two Sugar clients
 sharing the activity, their icon arrangement will also be compromised at
 the screen edge causing them to cramp up and overlap.

 (test environment: two F11 XOs running Sugar 0.84.0)

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Ticket URL: <http://dev.sugarlabs.org/ticket/507>
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