Copy-pasting messages inserts newlines and causes IncompleteParseError

[Wert5]

Running on development branch (commit cfc663b) with server http://shade.tacc.utexas.edu:3000/ in game StratIntact1 with password stratPass522

Reproduce by copying DAIDE message from message UI, wrapping with REJ ( ), and hitting send.

Error message in our bot (which catches ParseError so it continues running):
Rule 'message' matched in its entirety, but it didn't consume all the text. The non-matching portion of the text begins with '
' (line 4, column 59).
Traceback (most recent call last):
File "search_solve.py", line 2240, in handle_negotiations
python_msg = daide_to_python(v.message)
File "/diplomacy_cicero/daide_print.py", line 109, in daide_to_python
tree = grammar.parse(msg)
File "/opt/conda/lib/python3.8/site-packages/parsimonious/grammar.py", line 112, in parse
return self.default_rule.parse(text, pos=pos)
File "/opt/conda/lib/python3.8/site-packages/parsimonious/expressions.py", line 143, in parse
raise IncompleteParseError(text, node.end, self)
parsimonious.exceptions.IncompleteParseError: Rule 'message' matched in its entirety, but it didn't consume all the text. The non-matching portion of the text begins with '
' (line 4, column 59).

PARSE ERROR
REJ ( PRP ( AND ( XDO ( ( RUS AMY MOS ) MTO STP ) ) ( XDO ( ( RUS AMY WAR )
MTO SIL ) ) ( XDO ( ( RUS FLT SEV ) MTO BLA ) ) ( XDO ( ( RUS FLT (STP
SCS) ) MTO GOB ) ) ( XDO ( ( FRA AMY MAR ) MTO SPA ) ) ( XDO ( ( FRA AMY
PAR ) MTO BUR ) ) ( XDO ( ( FRA FLT BRE ) MTO ECH ) ) ) )<br>

I expected the message to be pasted exactly as it appeared so that wrapping it with REJ( ) would produce valid, parseable, DAIDE.