fix #34105, unescape triple-quoted strings after dedenting #35001
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It seems clear to me that triple-quoted strings should only specially handle whitespace that directly occurs in the source text, not including escape sequences. This also makes it easier to fix #34967, since if unescaping is done first then you get a UTF-8 error when we try to strip whitespace if you write invalid UTF-8 strings using escape sequences (which is allowed of course).
But, this could be breaking since it obviously changes the values of some string literals.
fix #34105