W. Trevor King added the comment:
In email._header_value_parser._Folded.append_if_fits, if I shift:
if token.has_fws:
ws = token.pop_leading_fws()
if ws is not None:
self.stickyspace += str(ws)
stickyspace_len += len(ws)
token._fold(self)
return True
to:
if token.has_fws:
ws = token.pop_leading_fws()
if ws is not None:
self.stickyspace += str(ws)
stickyspace_len += len(ws)
token._fold(self)
return True
I can avoid the recursion.
The problem seems to be that the "a aaaa…aaa" token/part contains folding white
space, but doesn't *start* with folding whitespace. Maybe the folding should
try to split on existing FWS, instead of just trying to pop leading FWS?
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<http://bugs.python.org/issue22684>
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