[Bugs] #2570 UNSP: gdk window obscured events no longer happen

[Sugar Labs Bugs]

#2570: gdk window obscured events no longer happen
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    Reporter:  dsd                        |          Owner:                             
        Type:  defect                     |         Status:  new                        
    Priority:  Unspecified by Maintainer  |      Milestone:  Unspecified by Release Team
   Component:  sugar                      |        Version:  0.90.x                     
    Severity:  Unspecified                |       Keywords:                             
Status_field:  Unconfirmed                |   Distribution:  Unspecified                
   Seeta_dev:                             |  
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 Somewhere after Sugar-0.84 (currently reproduced on 0.90.3), activities
 stopped receiving gtk.gdk.VISIBILITY_FULLY_OBSCURED events on their
 Activity objects when another activity is switched to or when the user
 changes to home/group/neighbourhood view.

 test case is something like:

 {{{
 self.add_events(gtk.gdk.VISIBILITY_NOTIFY_MASK)
 self.connect("visibility-notify-event", self._visibility_changed)

     def _visibility_changed(self, widget, event):
         print "VISIBILITY", event.state

 }}}

 On 0.84, you got a VISIBILITY_FULLY_OBSCURED event when switching to
 another view or activity. On 0.90, nothing.

 Record needs this to switch off the camera/microphone when the activity is
 no longer active.

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Ticket URL: <http://bugs.sugarlabs.org/ticket/2570>
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