[Bugs] #3361 Physics UNSP: Physics: grab objects crashes the activity

[Sugar Labs Bugs]

#3361: Physics: grab objects crashes the activity
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    Reporter:  manuq                      |          Owner:  garycmartin                
        Type:  defect                     |         Status:  assigned                   
    Priority:  Unspecified by Maintainer  |      Milestone:  Unspecified by Release Team
   Component:  Physics                    |        Version:  Git as of bugdate          
    Severity:  Unspecified                |       Keywords:  12.1.0, patch              
Distribution:  Unspecified                |   Status_field:  Unconfirmed                
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Changes (by manuq):

  * keywords:  12.1.0 => 12.1.0, patch


Comment:

 Attached two potential patches.  They are big because the eggs are being
 removed.

 In the first, pybox2d egg is removed, and Elements is fixed as per humitos
 patch, inside the egg binary.  In the second, I removed both eggs and
 unzipped Elements so this fix (and the potential new fixes to come) is not
 being done in a binary.  As Gary, humitos and I spotted, Elements is
 abandoned, this will not be fixed upstream.  And Physics may turn to use
 pybox2d directly.

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Ticket URL: <http://bugs.sugarlabs.org/ticket/3361#comment:20>
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