[Bugs] #2190 NORM: TamTamEdit selecting or deselecting instrument tracks with mouse click occasionally is not effective

[Sugar Labs Bugs]

#2190: TamTamEdit selecting or deselecting instrument tracks with mouse click
occasionally is not effective
----------------------------+-----------------------------------------------
    Reporter:  quozl        |          Owner:  alsroot                    
        Type:  defect       |         Status:  new                        
    Priority:  normal       |      Milestone:  Unspecified by Release Team
   Component:  TamTam       |        Version:                             
    Severity:  Major        |       Keywords:                             
Distribution:  Unspecified  |   Status_field:  New                        
----------------------------+-----------------------------------------------
 In TamTamEdit-53 on XO-1 and XO-1.5, the instrument tracks can be selected
 or deselected by clicking on the grey track background.  Mostly the event
 is properly handled.  Sometimes (~10%) the click event is missed by
 TamTamEdit.  Rarely (~2%) the click event is taken to be a repositioning
 of a note.

 Reported by Tabitha in [http://dev.laptop.org/ticket/9515 dev.laptop.org
 #9515]

 Reproduced by me.

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Ticket URL: <http://bugs.sugarlabs.org/ticket/2190>
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