[Bugs] #4133 sugar-toolkit-gtk3 IMME: Gtk: some widgets do receive a GDK_CROSSING_UNGRAB leave event when tapped

[Sugar Labs Bugs]

#4133: Gtk: some widgets do receive a GDK_CROSSING_UNGRAB leave event when tapped
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    Reporter:  erikos              |          Owner:  garnacho
        Type:  defect              |         Status:  assigned
    Priority:  Immediate           |      Milestone:  0.98    
   Component:  sugar-toolkit-gtk3  |        Version:  0.97.x  
    Severity:  Blocker             |       Keywords:          
Distribution:  OLPC                |   Status_field:  Assigned
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Comment(by garnacho):

 This is related to ticket #4132, the bogus button mask on ButtonRelease
 seems to trigger gdk to go again through pointer grab checks, which then
 emits the spurious crossing event. The patch in
 https://bugs.freedesktop.org/show_bug.cgi?id=56558#c1 fixes the issue

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Ticket URL: <http://bugs.sugarlabs.org/ticket/4133#comment:2>
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