[Bugs] #2698 UNSP: Calculate allows default variables to be redefined

[Sugar Labs Bugs]

#2698: Calculate allows default variables to be redefined
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    Reporter:  greenfeld                  |          Owner:  rwh                        
        Type:  enhancement                |         Status:  new                        
    Priority:  Unspecified by Maintainer  |      Milestone:  Unspecified by Release Team
   Component:  Calculate                  |        Version:  0.92.x                     
    Severity:  Minor                      |       Keywords:                             
Status_field:  Unconfirmed                |   Distribution:  OLPC                       
   Seeta_dev:                             |  
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 I may or may not have already filed this somewhere, but:

 Calculate provides several default variables such as "e", "pi", etc.

 These can all be overridden with new numbers by setting a label of the
 same name.  And then Sugar, by defaulting to starting the last journal
 entry for an activity, can make it non-obvious how to get to a session
 where these have not been changed.

 Should this be allowed?

 Seen in Calculate-36/OLPC 11.2.0 os13.

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Ticket URL: <http://bugs.sugarlabs.org/ticket/2698>
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