[Bugs] #3579 Visual Match UNSP: A card is "unknown" by the game

[Sugar Labs Bugs]

#3579: A card is "unknown" by the game
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    Reporter:  humitos                    |          Owner:  walter                     
        Type:  defect                     |         Status:  new                        
    Priority:  Unspecified by Maintainer  |      Milestone:  Unspecified by Release Team
   Component:  Visual Match               |        Version:  Unspecified                
    Severity:  Unspecified                |       Keywords:                             
Distribution:  Unspecified                |   Status_field:  Unconfirmed                
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Comment(by walter):

 The attached image illustrates the problem, I repeatedly dragged the red O
 on and off of the match area with a rapid motion and finally managed to
 get it back to the grid without removing it from the match area as far as
 the internals of the program are concerned.

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Ticket URL: <http://bugs.sugarlabs.org/ticket/3579#comment:2>
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