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Fix iter_messages was stopping too early in some channels
Closes #3949.
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@ -204,7 +204,20 @@ class _MessagesIter(RequestIter):
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message._finish_init(self.client, entities, self.entity)
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self.buffer.append(message)
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if len(r.messages) < self.request.limit:
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# Some channels are "buggy" and may return less messages than
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# requested (apparently, the messages excluded are, for example,
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# "not displayable due to local laws").
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#
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# This means it's not safe to rely on `len(r.messages) < req.limit` as
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# the stop condition. Unfortunately more requests must be made.
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#
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# However we can still check if the highest ID is equal to or lower
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# than the limit, in which case there won't be any more messages
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# because the lowest message ID is 1.
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#
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# We also assume the API will always return, at least, one message if
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# there is more to fetch.
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if not r.messages or r.messages[0].id <= self.request.limit:
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return True
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# Get the last message that's not empty (in some rare cases
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