[Bugs] #2745 UNSP: Turtleart doesn't fill offscreen surface area with content.

[Sugar Labs Bugs]

#2745: Turtleart doesn't fill offscreen surface area with content.
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    Reporter:  greenfeld                  |          Owner:  walter                     
        Type:  defect                     |         Status:  new                        
    Priority:  Unspecified by Maintainer  |      Milestone:  Unspecified by Release Team
   Component:  Turtleart                  |        Version:  0.92.x                     
    Severity:  Minor                      |       Keywords:                             
Status_field:  New                        |   Distribution:  OLPC                       
   Seeta_dev:                             |  
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 godiard spotted a "video corruption" issue with TurtleArt which likely is
 TurtleArt's fault.

 According to jnettlet, Turtle art draws a rendering surface larger than
 the screen. but doesn't fill it with a background color beyond the
 dimensions of the screen.  So the contents of offscreen video memory are
 seen once you scroll down or sideways past what already is rendered, which
 could look like many things depending on what is in video RAM at that
 point.

 Reproduction:
  1. Start Turtleart.
  2. Using the scrollbars for the main canvas, scroll downward in the
 drawing area a significant amount.

 Seen in OLPC 11.2.0 os14 on both XO-1 & XO-1.5.

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Ticket URL: <http://bugs.sugarlabs.org/ticket/2745>
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