[Bugs] #3423 UNSP: TA save SVG saves nothing

[Sugar Labs Bugs]

#3423: TA save SVG saves nothing
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    Reporter:  tonyforster                |          Owner:  walter                     
        Type:  defect                     |         Status:  new                        
    Priority:  Unspecified by Maintainer  |      Milestone:  Unspecified by Release Team
   Component:  Turtleart                  |        Version:  Unspecified                
    Severity:  Unspecified                |       Keywords:                             
Distribution:  Unspecified                |   Status_field:  Unconfirmed                
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Comment(by walter):

 Thanks for testing.

 > does not record in single step if the save svg block is introduced to
 the canvas after the
 > drawing is done. This is presumably a compromise to save execution time,
 not keeping an
 > unnecessary record of draw events in svg format?

 Yes. I only keep the SVG surface around if I think the user is intending
 to save to SVG at some point. I only make that assumption if a save SVG
 block is on the canvas somewhere. Otherwise, twice as much writing. I
 could revisit this assumption if you think it is worth the tradeoff (need
 to run some numbers on an XO 1 to measure the impact).

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Ticket URL: <http://bugs.sugarlabs.org/ticket/3423#comment:6>
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