Hilight differences between the searched word and the resulting words (diff style)

[hisbaan]

As the title says (with an optional flag), show the differences between the queried and resulting words. Showing removals is not recommended as that would require some sort of thinner character which I don't think would look very nice. Showing additions and substitutions should be easy enough. Showing transpositions as two insertions may be simpler? I'm not quite sure how that would work, but it should be doable.