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@@ -15,7 +15,7 @@ class EngineAction:
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raise NotImplementedError()
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def execute(self, overlay, xkeyevent):
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- if not self._target_engine_index:
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+ if self._target_engine_index is None:
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for target_window in overlay.engine_windows:
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self.execute_on_window(overlay, xkeyevent, target_window)
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elif self._target_engine_index >= len(overlay.engine_windows):
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