[Bugs] #4143 Paint UNSP: Paint: undo break alpha channel

[Sugar Labs Bugs]

#4143: Paint: undo break alpha channel
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    Reporter:  godiard                    |          Owner:  godiard    
        Type:  defect                     |         Status:  new        
    Priority:  Unspecified by Maintainer  |      Milestone:  0.98       
   Component:  Paint                      |        Version:  Unspecified
    Severity:  Unspecified                |       Keywords:             
Distribution:  Unspecified                |   Status_field:  Unconfirmed
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 If you do:
 * Draw
 * draw more
 * Undo
 * draw
 After the undo, draw does not use transparency and a artifact appear
 changing the color in the redraw area.

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Ticket URL: <http://bugs.sugarlabs.org/ticket/4143>
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