[Bugs] #4024 sugar NORM: Touch crashes on 13.1.0 os5

[Sugar Labs Bugs]

#4024: Touch crashes on 13.1.0 os5
----------------------------+-----------------------------------------------
    Reporter:  humitos      |          Owner:  erikos     
        Type:  defect       |         Status:  new        
    Priority:  Normal       |      Milestone:  0.98       
   Component:  sugar        |        Version:  Unspecified
    Severity:  Unspecified  |       Keywords:             
Distribution:  Unspecified  |   Status_field:  Unconfirmed
----------------------------+-----------------------------------------------
 I'm not sure what is happening but I found that Touch Gestures are not
 working properly on ImageViewer because the Activity crashes with a SIGNAL
 11 (SIGSEGV) that means: ''a segmentation fault''

 This happens immediately you touch the screen with two fingers.

 The strange thing is that ImageViewer works on os5 with an older version
 of the git repository and the same patch that adds gestures. I tried to
 find out what was the error introduced in the newest version but I
 couldn't. So, I copy some of the ImageViewer code to make a new Activity
 without all the ImageViewer logic (to keep it simple) as an example to
 show the issue.

 I'm attaching a {{{.tar.gz}}} file that contains a very simple Sugar
 Activity that shows a gray screen (it is just a ScrolledWindow inside a
 Notebook) and when you touch it the Activity crashes with SIGNAL 11.

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Ticket URL: <http://bugs.sugarlabs.org/ticket/4024>
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