[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 tomeu):

 Replying to [comment:8 alsroot]:
 > Replying to [comment:7 tomeu]:
 > > If I remember correctly, read_file is called in the canvas map handler
 because Write could set the file to load before abiwidget was mapped.
 > >
 > > This patch would break it because the main window is mapped before its
 children, though maybe abiwidget has been fixed since.
 > I tried start_new/load_jobject with git Write and it works w/o any
 critical difference

 That's nice, but I'm a bit worried about other activities. Checking all of
 them can be quite a bit of work.

 What if in set_canvas we disconnect the previous handler if there's one
 and then connect to the new one?

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Ticket URL: <http://dev.sugarlabs.org/ticket/428#comment:9>
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