[Bugs] #3105 Paint UNSP: Paint: undo does not work reliably

[Sugar Labs Bugs]

#3105: Paint: undo does not work reliably
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    Reporter:  erikos                     |          Owner:  humitos                    
        Type:  defect                     |         Status:  accepted                   
    Priority:  Unspecified by Maintainer  |      Milestone:  Unspecified by Release Team
   Component:  Paint                      |        Version:  0.93.x                     
    Severity:  Unspecified                |       Keywords:  patch                      
Distribution:  Unspecified                |   Status_field:  Unconfirmed                
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Comment(by humitos):

 I added a patch that adds a new Spin Button to show every "undo item" in
 the {{{self._undo_list}}}. This is useful to test if the "undo item" is
 being shown or not.

 I don't know why but every time that I use the bucket twice and click on
 "Undo" both of the fills are undone. After that when I press on "Redo"
 just the first one is redone.

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Ticket URL: <http://bugs.sugarlabs.org/ticket/3105#comment:4>
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