I think connect_after makes more sense here
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@ -398,7 +398,7 @@ text/plain
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#here, we define some widget internal values
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widget._expose_data = { 'color': color, 'coord' : coord }
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#redraw by forcing an event
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connec = widget.connect('expose-event', self.on_expose_event)
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connec = widget.connect_after('expose-event', self.on_expose_event)
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widget.window.invalidate_rect(rect, True)
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widget.window.process_updates(True)
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#finaly reset the values
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