[Bugs] #4605 Sugar URGE: "View Source" crashes in every activity

[Sugar Labs Bugs]

#4605: "View Source" crashes in every activity
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  Reporter:  manuq        |            Owner:  manuq
      Type:  defect       |           Status:  new
  Priority:  Urgent       |        Milestone:  Unspecified
 Component:  Sugar        |          Version:  Unspecified
  Severity:  Unspecified  |       Resolution:
  Keywords:               |  Distribution/OS:  Unspecified
Bug Status:  New          |
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Comment (by erikos):

 This is an issue because View Source tries to display the gtk2 sugar-
 toolkit, which is not present anymore in sugar-build. You can see this by
 displaying the gtk3 toolkit, like:

 {{{
 diff --git a/src/jarabe/view/viewsource.py b/src/jarabe/view/viewsource.py
 index 99b9c9d..a486005 100644
 --- a/src/jarabe/view/viewsource.py
 +++ b/src/jarabe/view/viewsource.py
 @@ -101,8 +101,8 @@ def setup_view_source(activity):
      sugar_toolkit_path = None
      for path in sys.path:
          if path.endswith('site-packages'):
 -            if os.path.exists(os.path.join(path, 'sugar')):
 -                sugar_toolkit_path = os.path.join(path, 'sugar')
 +            if os.path.exists(os.path.join(path, 'sugar3')):
 +                sugar_toolkit_path = os.path.join(path, 'sugar3')
                  break

      view_source = ViewSource(window_xid, bundle_path, document_path,
 }}}

 A more fallback proven fix would be to fallback on the gtk2 toolkit if the
 gtk3 one is not available.
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Ticket URL: <http://bugs.sugarlabs.org/ticket/4605#comment:4>
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