#5936 NORM Never A: Race when switching zoom level while frame is being hidden

[Zarro Boogs per Child]

#5936: Race when switching zoom level while frame is being hidden
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 Reporter:  dsd      |       Owner:  marco         
     Type:  defect   |      Status:  new           
 Priority:  normal   |   Milestone:  Never Assigned
Component:  sugar    |     Version:                
 Keywords:  review?  |    Verified:  0             
 Blocking:           |   Blockedby:                
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 If you start Sugar, press F2, wait a bit, press F3, then you end up at the
 home screen with the frame showing.

 If you then press F2, and immediately then press F3 while the frame is
 still fading away, you are returned back to the home screen but the frame
 is not being shown.

 This is because when returning to the home screen, frame.show() thinks the
 frame is already visible (this is true -- it is partially visible) and
 therefore it has nothing to do.

 Following on from #5911 and #5750, here is a patch which avoids this race
 by detecting the fact that the frame is currently being hidden, so
 frame.show() does have to run.

-- 
Ticket URL: <http://dev.laptop.org/ticket/5936>
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