(scan_lists): Improve smarts for backwards scan of comments.
Don't modify comstyle inside that loop. If string quotes don't match up, don't take value from OFROM; instead, parse forward using scan_sexps_forward. (scan_sexps_forward): Return value via a pointer passed in. New element in state contains char addr of last comment-starter seen. (Fparse_partial_sexp): Change call to scan_sexps_forward.
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