#8432 NORM Not Tri: to improve activity switching performance only take screenshots on activity save and close

[Zarro Boogs per Child]

#8432: to improve activity switching performance only take screenshots on activity
save and close
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 Reporter:  erikg         |         Owner:               
     Type:  defect        |        Status:  new          
 Priority:  normal        |     Milestone:  Not Triaged  
Component:  not assigned  |       Version:  not specified
 Keywords:                |   Next_action:  never set    
 Verified:  0             |     Blockedby:               
 Blocking:                |  
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 Currently we take activity screenshots on every:

   - frame visibility
   - tabbing start
   - activity next tab
   - activity previous tab
   - zoom into activity view
   - activity close (twice)

 after the patch screenshots are taken on these events:

   - activity close (once)
   - activity keep / save

 The screenshots are taken in Activity.copy() and Activity.close() (in
 activity.py).

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Ticket URL: <http://dev.laptop.org/ticket/8432>
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