[Bugs] #2184 sugar HIGH: Occasional black Palettes

[Sugar Labs Bugs]

#2184: Occasional black Palettes
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    Reporter:  carrott  |          Owner:  manuq   
        Type:  defect   |         Status:  assigned
    Priority:  High     |      Milestone:  1.0     
   Component:  sugar    |        Version:  0.98.x  
    Severity:  Major    |       Keywords:  dextrose
Distribution:  Fedora   |   Status_field:  New     
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Comment(by manuq):

 Adding logging we can see _PaletteWindowWidget method do_draw stops being
 called at the point the issue starts to happen.  Also adding a callback to
 the 'draw' signal of the same window shows that the callback stops being
 called.

 The issue goes away if we remove set_resizable(False) in the
 _PaletteWindowWidget constructor.  This makes the palette resizable
 though.  We can sort out the user resizing the palette adding
 set_has_resize_grip(False).  But we'll still have to sort out how to go
 back to the size of the palette containing only the header.  Patch
 attached for testing.

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Ticket URL: <http://bugs.sugarlabs.org/ticket/2184#comment:16>
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