[Bugs] #3845 sugar-toolkit-gtk3 UNSP: Get supported image formats from GdkPixbuf

[Sugar Labs Bugs]

#3845: Get supported image formats from GdkPixbuf
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    Reporter:  godiard                    |          Owner:  erikos                     
        Type:  defect                     |         Status:  new                        
    Priority:  Unspecified by Maintainer  |      Milestone:  Unspecified by Release Team
   Component:  sugar-toolkit-gtk3         |        Version:  Unspecified                
    Severity:  Unspecified                |       Keywords:                             
Distribution:  Unspecified                |   Status_field:  Unconfirmed                
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 Right now, only a few formats are filtered as Image, and Gtk support more.
 We already have a two years old ticket about adding SVG format (#2398).
 Is really easy, and fast, ask to Gtk about the supported formats.
 Two patches, one for sugar-base and another for sugar-toolkit-gtk3 are
 attached.

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Ticket URL: <http://bugs.sugarlabs.org/ticket/3845>
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