[Bugs] #1520 UNSP: alt-tab should do nothing when only the journal is running

[Sugar Labs Bugs]

#1520: alt-tab should do nothing when only the journal is running
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    Reporter:  mtd                        |          Owner:  tomeu                      
        Type:  defect                     |         Status:  new                        
    Priority:  Unspecified by Maintainer  |      Milestone:  Unspecified by Release Team
   Component:  sugar                      |        Version:  Unspecified                
    Severity:  Unspecified                |       Keywords:                             
Distribution:  Unspecified                |   Status_field:  Unconfirmed                
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 If only the Journal - and no other activities - is running, alt-tab should
 do nothing.

 Currently, it shows the frame and switches to the journal, and then keeps
 switching to it (which looks to the user just like the frame is getting
 revealed and hidden for each Alt+Tab press).

 Releated to #1518 .

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Ticket URL: <http://bugs.sugarlabs.org/ticket/1520>
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