[Bugs] #4149 sugar-toolkit-gtk3 UNSP: sugar-artwork: Black background in transparent objects over Gtk.Fixed

[Sugar Labs Bugs]

#4149: sugar-artwork: Black background in transparent objects over Gtk.Fixed
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    Reporter:  godiard                    |          Owner:  manuq      
        Type:  defect                     |         Status:  assigned   
    Priority:  Unspecified by Maintainer  |      Milestone:  0.98       
   Component:  sugar-toolkit-gtk3         |        Version:  Unspecified
    Severity:  Unspecified                |       Keywords:             
Distribution:  Unspecified                |   Status_field:  Unconfirmed
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Comment(by manuq):

 Doing the views transparent with the css provokes the same issue in Paint,
 but views are transparent in other Sugar places.  So seems like a bug in
 Paint/Cairo.

 I tested setting the view to transparent with the theme and removing the
 Paint override.  In gtk-widgets.css, the change is:

 {{{
 .view {
     border-width: 0px;
     border-style: none;
     border-radius: 0px;
     padding: 0px;
 -    background-color: @white;
 +    background-color: transparent;
 }
 }}}

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Ticket URL: <http://bugs.sugarlabs.org/ticket/4149#comment:3>
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