[Bugs] #4134 sugar-toolkit-gtk3 URGE: Canvas auto panning based on input focus

[Sugar Labs Bugs]

#4134: Canvas auto panning based on input focus
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    Reporter:  erikos              |          Owner:  garnacho
        Type:  defect              |         Status:  new     
    Priority:  Urgent              |      Milestone:  0.98    
   Component:  sugar-toolkit-gtk3  |        Version:  0.97.x  
    Severity:  Major               |       Keywords:          
Distribution:  OLPC                |   Status_field:  Assigned
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Comment(by garnacho):

 There's a few issues I could see here:
 1) The maliit IM context emits the osk signal far too many times, and on
 all imcontext around, not just on the focus widget's
 2) Input method usage in the VTE terminal widget and WebKit don't fully
 behave like GtkTextView's or GtkEntry's, this was the reason the clear-
 request-area signal wasn't being emitted properly on Terminal or Browse
 3) There are some intrinsic synchronicity issues on the handling of focus-
 in, button-press, button-release and request-clear-area, hence some
 funkyness when the scrolledwindow leaves place for the osk

 The last patch I submitted does what as much as possible on 1, fixes 2 and
 partly fixes 3

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Ticket URL: <http://bugs.sugarlabs.org/ticket/4134#comment:12>
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