[Bugs] #2028 UNSP: A save dialog should be offered when leaving TA (if something has been done)

[Sugar Labs Bugs]

#2028: A save dialog should be offered when leaving TA (if something has been
done)
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    Reporter:  rgs                        |          Owner:  walter                     
        Type:  defect                     |         Status:  new                        
    Priority:  Unspecified by Maintainer  |      Milestone:  Unspecified by Release Team
   Component:  Turtleart                  |        Version:  Unspecified                
    Severity:  Unspecified                |       Keywords:  turtleart save gnome       
Distribution:  Unspecified                |   Status_field:  Unconfirmed                
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Comment(by rgs):

 Btw, do we have something like canvas_has_blocks()? Or start_has_blocks()?
 If we don't, how hard would it be to implement such method.

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Ticket URL: <http://bugs.sugarlabs.org/ticket/2028#comment:1>
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