[Bugs] #3895 sugar UNSP: Tabbinghandler not working

[Sugar Labs Bugs]

#3895: Tabbinghandler not working
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    Reporter:  erikos                     |          Owner:  erikos    
        Type:  defect                     |         Status:  new       
    Priority:  Unspecified by Maintainer  |      Milestone:  0.98      
   Component:  sugar                      |        Version:  0.97.x    
    Severity:  Blocker                    |       Keywords:  regression
Distribution:  Unspecified                |   Status_field:  Assigned  
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Comment(by manuq):

 Partial patch attached. I'm not sure about the parameters passed to the
 device.grab() method.

 Pressing Alt-Tab I can switch to the next activity but then Sugar hangs.
 Log shows that device.ungrab() is not being called.

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Ticket URL: <http://bugs.sugarlabs.org/ticket/3895#comment:3>
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