[Bugs] #3916 Abacus UNSP: Abacus activity should warn about data loss when changing styles

[Sugar Labs Bugs]

#3916: Abacus activity should warn about data loss when changing styles
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    Reporter:  greenfeld                  |          Owner:  walter                     
        Type:  defect                     |         Status:  new                        
    Priority:  Unspecified by Maintainer  |      Milestone:  Unspecified by Release Team
   Component:  Abacus                     |        Version:  Unspecified                
    Severity:  Unspecified                |       Keywords:                             
Distribution:  OLPC                       |   Status_field:  Unconfirmed                
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 The Abacus activity should warn about data loss when changing styles.

 Some of the styles are meant for large positive integers; others can go
 negative, while others support fractions.

 If the new style supports representing the old value it is currently is
 kept; otherwise we start with an abacus set to show a value of zero.

 Seen in OLPC 13.1.0 os2/Abacus-35.

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Ticket URL: <http://bugs.sugarlabs.org/ticket/3916>
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