[Bugs] #4494 sugar-toolkit-gtk3 UNSP: sugar-activity: Activity bundle path should be prepended to sys.path

[Sugar Labs Bugs]

#4494: sugar-activity: Activity bundle path should be prepended to sys.path
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    Reporter:  gaudenz                    |          Owner:  erikos                     
        Type:  defect                     |         Status:  new                        
    Priority:  Unspecified by Maintainer  |      Milestone:  Unspecified by Release Team
   Component:  sugar-toolkit-gtk3         |        Version:  Unspecified                
    Severity:  Major                      |       Keywords:                             
Distribution:  Unspecified                |   Status_field:  New                        
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 The bundle_path should be prepended to sys.path in sugar-activity instead
 of appending it. Modules from the bundle should take precedence over the
 same modules already in the system path.

 This is important for activities installed from system packages which are
 updated by the user. Otherwise the activity class is taken from the users
 Activity folder while the modules are imported from the system package.

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Ticket URL: <http://bugs.sugarlabs.org/ticket/4494>
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