[Trac #377] memosono allows user to see more than two tiles at once

[Zarro Boogs per Child]

#377: memosono allows user to see more than two tiles at once
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 Reporter:  ywwg    |       Owner:  blizzard
     Type:  defect  |      Status:  new     
 Priority:  normal  |   Milestone:  BTest-2 
Component:  distro  |    Keywords:          
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 When clicking quickly in memosono, I can see more than two images at the
 same time.  This lets me cheat by not having to remember as many empty
 squares.

 Steps to reproduce:
 Click on multiple boxes rapidly, revealing the images beneath

 expected results:
 I should not be able to reveal a new image while two images are being
 shown.  Buttons should be disabled or not respond to clicks during this
 time.

 actual results:
 While the first two images are being shown, I can reveal more images.

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Ticket URL: <http://dev.laptop.org/ticket/377>
One Laptop Per Child <http://laptop.org/>