Don't fail to expose if there is no invoker.
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@ -257,7 +257,7 @@ class Palette(gtk.Window):
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def do_expose_event(self, event):
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def do_expose_event(self, event):
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# We want to draw a border with a beautiful gap
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# We want to draw a border with a beautiful gap
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if self._invoker.has_rectangle_gap():
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if self._invoker is not None and self._invoker.has_rectangle_gap():
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invoker = self._invoker.get_rect()
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invoker = self._invoker.get_rect()
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palette = self.get_rect()
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palette = self.get_rect()
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