Fix has_unknown_spaces in Doc.copy
@@ -983,6 +983,7 @@ cdef class Doc:
other.is_parsed = self.is_parsed
other.is_morphed = self.is_morphed
other.sentiment = self.sentiment
+ other.has_unknown_spaces = self.has_unknown_spaces
other.user_hooks = dict(self.user_hooks)
other.user_token_hooks = dict(self.user_token_hooks)
other.user_span_hooks = dict(self.user_span_hooks)
