Function xwords::fill::words_orthogonal_to_word

pub fn words_orthogonal_to_word<'s>(
    to_fill: &'s WordBoundary, 
    word_boundary_lookup: &HashMap<(Direction, usize, usize), &'s WordBoundary, BuildHasherDefault<FxHasher>>
) -> Vec<&'s WordBoundary>

Identifies WordBoundaries that intersect a given WordBoundary. This is useful to identify word that are affected by a given WordBoundary being filled.