pub(crate) fn change_positions(lhs_src: &str, rhs_src: &str) -> Vec<MatchedPos>Notable traits for Vec<u8, A>impl<A> Write for Vec<u8, A>where
    A: Allocator,
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Build a vec of MatchedPos, performing a textual diff. Match up unchanged lines, and match up unchanged words within novel lines.

The resulting vec only has novel items from the LHS. Callers should do change_positions(rhs_src, lhs_src) to obtain novel MatchedPos values for the RHS.