create also _tasks holder
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@ -11,6 +11,7 @@ class CallbacksHolder:
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def __init__(self):
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def __init__(self):
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super().__init__()
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super().__init__()
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self._callbacks = {}
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self._callbacks = {}
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self._tasks = {}
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def register(self, key:Any, callback:Callable):
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def register(self, key:Any, callback:Callable):
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if key not in self._callbacks:
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if key not in self._callbacks:
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