[Bugs] #4279 sugar-toolkit-gtk3 NORM: tray items not always left aligned

[Sugar Labs Bugs]

#4279: tray items not always left aligned
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    Reporter:  erikos              |          Owner:  manuq     
        Type:  defect              |         Status:  new       
    Priority:  Normal              |      Milestone:  0.98      
   Component:  sugar-toolkit-gtk3  |        Version:  0.97.x    
    Severity:  Minor               |       Keywords:  regression
Distribution:  OLPC                |   Status_field:  Assigned  
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 When testing #3565 I came across the following issue:

 - open Browse

 - create a session bookmark

 ---> a bookmark is added to the tray, left to it is some space for the
 'go-forward' button but it is not shown

 - add more bookmarks until the forward/backward buttons are shown

 - now remove one bookmark

 ---> the bookmarks are now left aligned, no space reserved for the forward
 button

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Ticket URL: <http://bugs.sugarlabs.org/ticket/4279>
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