[Bugs] #1300 UNSP: Simple scheme for hidding ToolbarBox subpalettes

[SugarLabs Bugs]

#1300: Simple scheme for hidding ToolbarBox subpalettes
------------------------------------------+---------------------------------
    Reporter:  alsroot                    |          Owner:  erikos           
        Type:  defect                     |         Status:  new              
    Priority:  Unspecified by Maintainer  |      Milestone:  0.86             
   Component:  sugar-toolkit              |        Version:  Git as of bugdate
    Severity:  Unspecified                |       Keywords:  r?               
Distribution:  Unspecified                |   Status_field:  Unconfirmed      
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 |TestCase|
 * open Write
 * open palette(not subtoolbar) for Paragraph
 * change Bullet list combobox
 * move cursor away from subpalette
 * subpalette wasn't closed

 The problem is, having followed lines in PaletteWindow:
 {{{
     def __enter_notify_event_cb(self, widget, event):
         if event.detail != gtk.gdk.NOTIFY_INFERIOR and \
                 event.mode == gtk.gdk.CROSSING_NORMAL:
             self.on_enter(event)

     def __leave_notify_event_cb(self, widget, event):
         if event.detail != gtk.gdk.NOTIFY_INFERIOR and \
                 event.mode == gtk.gdk.CROSSING_NORMAL:
             self.on_leave(event)
 }}}
 there is not chance to detect leaving palette(and entering to combo) and
 leaving combo(and back entering to palette) in ToolbarBox._Palette,
 _Palette can catch only back entering.

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Ticket URL: <http://dev.sugarlabs.org/ticket/1300>
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