[Bugs] #2570 UNSP: gdk window obscured events don't always happen

[Sugar Labs Bugs]

#2570: gdk window obscured events don't always happen
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    Reporter:  dsd                        |          Owner:  erikos                     
        Type:  defect                     |         Status:  assigned                   
    Priority:  Unspecified by Maintainer  |      Milestone:  Unspecified by Release Team
   Component:  sugar                      |        Version:  0.92.x                     
    Severity:  Unspecified                |       Keywords:  11.3.0                     
Distribution:  Unspecified                |   Status_field:  Unconfirmed                
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Comment(by manuq):

 Finally, I added the logging line and did the tests, first I did a simpler
 one for comparison:

 1. I started new Record, and closed it - I have the following
 visibilities: UNOBSCURED, PARTIAL, UNOBSCURED (this is because of the
 activity's description screen on close)

 2. I did as Daniel's test above - I've got the following visibilities:
 UNOBSCURED, PARTIAL, UNOBSCURED, PARTIAL, UNOBSCURED.  Between the first
 two, I went to the neighborhood and to terminal, the next "partial" is
 because of the frame while switching to Record again, and the last
 visibilities are the same as the first test above, produced by the
 description screen on close.

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Ticket URL: <http://bugs.sugarlabs.org/ticket/2570#comment:10>
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