[Bugs] #3664 Paint UNSP: Strange behavior after undo and draw

[Sugar Labs Bugs]

#3664: Strange behavior after undo and draw
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    Reporter:  humitos                    |          Owner:  humitos    
        Type:  defect                     |         Status:  new        
    Priority:  Unspecified by Maintainer  |      Milestone:  0.96       
   Component:  Paint                      |        Version:  Unspecified
    Severity:  Unspecified                |       Keywords:  patch      
Distribution:  Unspecified                |   Status_field:  Unconfirmed
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 Steps to reproduce it:

  1. Draw 13 vertical lines (we need to reach the MAX_UNDO_STEPS (12))
  1. Click 4 times the "undo" button
  1. Draw a new horizontal line
  1. Click on "redo"

 Issue:

 Your horizontal line disappears and two vertical lines appears.

 Expected behavior:

 Disable the ability to redo after going back with "undo" and draw
 something again.

 I found this bug while I was working on #3105 and I uploaded the patch to
 that ticket. So, this bug is already solved.

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Ticket URL: <http://bugs.sugarlabs.org/ticket/3664>
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