[Bugs] #3790 Paint UNSP: Rainbow tool doesn't work in the same way than in gtk2 version

[Sugar Labs Bugs]

#3790: Rainbow tool doesn't work in the same way than in gtk2 version
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    Reporter:  humitos                    |          Owner:  godiard                    
        Type:  defect                     |         Status:  new                        
    Priority:  Unspecified by Maintainer  |      Milestone:  Unspecified by Release Team
   Component:  Paint                      |        Version:  Unspecified                
    Severity:  Unspecified                |       Keywords:  gtk3, screenshot           
Distribution:  Unspecified                |   Status_field:  Unconfirmed                
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Comment(by humitos):

 After drawing something on the Gtk3 version if I press "Ctrl + Z" and keep
 drawing on the screen the rainbow loses the brightness. Check the
 screenshot

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Ticket URL: <http://bugs.sugarlabs.org/ticket/3790#comment:1>
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