Adjust back/forward method arguments in AbstractHistory class
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@ -465,10 +465,10 @@ class AbstractHistory:
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def current_idx(self):
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raise NotImplementedError
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def back(self):
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def back(self, count):
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raise NotImplementedError
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def forward(self):
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def forward(self, count):
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raise NotImplementedError
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def can_go_back(self):
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