[Bugs] #428 UNSP: connect('map') to activity widow not to current canvas

[SugarLabs Bugs]

#428: connect('map') to activity widow not to current canvas
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    Reporter:  alsroot                    |          Owner:  marcopg    
        Type:  defect                     |         Status:  new        
    Priority:  Unspecified by Maintainer  |      Milestone:  0.84       
   Component:  sugar-toolkit              |        Version:  0.83.x     
    Severity:  Unspecified                |     Resolution:             
    Keywords:  r?                         |   Distribution:  Unspecified
Status_field:  Unconfimed                 |  
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Comment(by alsroot):

 Replying to [comment:9 tomeu]:
 > That's nice, but I'm a bit worried about other activities. Checking all
 of them can be quite a bit of work.
 from soas-1's only 3 activity uses map event for set_cavas's widget and
 they are ok (in fact they uses that in #267 way)

 > What if in set_canvas we disconnect the previous handler if there's one
 and then connect to the new one?
 problem still exists - if user wants set_canvas() to set current tab(after
 changing tab in ActivitToolbox) it will catch one read_file() per each tab
 changing

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Ticket URL: <http://dev.sugarlabs.org/ticket/428#comment:10>
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