#3717 HIGH Untriag: Calculator parses negation wrong (--1)=-1

[Zarro Boogs per Child]

#3717: Calculator parses negation wrong (--1)=-1
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 Reporter:  seberg               |       Owner:  rwh      
     Type:  defect               |      Status:  new      
 Priority:  high                 |   Milestone:  Untriaged
Component:  calculator-activity  |     Version:           
 Keywords:                       |    Verified:  0        
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 If a number has two minus in front or -+, etc. the parser seems to only
 see the last sign. This gets even odder with brackets.

 Examples:

 --2 = -2
 12--+2 = 10
 12-(-(2)) = 10

 etc.

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Ticket URL: <https://dev.laptop.org/ticket/3717>
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