[Bugs] #4376 Ruler UNSP: Ruler 25 custom units

[Sugar Labs Bugs]

#4376: Ruler 25 custom units
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    Reporter:  tonyforster                |          Owner:  walter                     
        Type:  defect                     |         Status:  closed                     
    Priority:  Unspecified by Maintainer  |      Milestone:  Unspecified by Release Team
   Component:  Ruler                      |        Version:  Unspecified                
    Severity:  Unspecified                |     Resolution:  fixed                      
    Keywords:                             |   Distribution:  Unspecified                
Status_field:  Unconfirmed                |  
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Comment(by tonyforster):

 > It won't accept 0 or non-numeric inputs: switches to default (inches) in
 those cases. I suppose an alert would be better.
 >
 > Regarding negative numbers, I use abs of the value input.
 I like the idea of reflecting on what 0 or -ve means so I would prefer
 some interesting response. A divide  by zero error message is good,
 reflect on the problems of constructing a ruler with an infinite number of
 marks at zero spacing. For -ve you could for example put 0 on the screen
 right or use -ve markings from the left

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Ticket URL: <http://bugs.sugarlabs.org/ticket/4376#comment:7>
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