[Bugs] #756 HIGH: shell consumes lots of cpu on XO

[SugarLabs Bugs]

#756: shell consumes lots of cpu on XO
----------------------------+-----------------------------------------------
    Reporter:  tomeu        |          Owner:  erikos           
        Type:  defect       |         Status:  assigned         
    Priority:  High         |      Milestone:  0.84             
   Component:  sugar        |        Version:  Git as of bugdate
    Severity:  Blocker      |     Resolution:                   
    Keywords:               |   Distribution:  Unspecified      
Status_field:  Unconfirmed  |  
----------------------------+-----------------------------------------------
Changes (by tomeu):

  * owner:  tomeu => erikos
  * status:  new => assigned
  * severity:  Major => Blocker


Comment:

 Replying to [comment:1 tomeu]:
 >
 > But it's still doing too much work. I guess it's updating widgets even
 when nothing changed.

 Confirmed, we should apply the patch above for 0.84 and make sure for 0.86
 that nothing expensive is done when nothing changes. One idea is to wrap
 all instance variables that influence the UI in methods such as:

 {{{
     def _set_X(self, new_X):
         if self._X == new_X:
             return
         self._X = new_X
         [update UI]
 }}}

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Ticket URL: <http://dev.sugarlabs.org/ticket/756#comment:2>
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