[PATCH 3 of 3] graphmod: use different styles for different edge types

[timeless]

Martijn Pieters <mj at zopatista.com> wrote:
> Putting the augmented dagwalker behind a feature flag is harder, as
> all code that consumes the parents info needs to know about both the
> old and new format. Drawing the different edge styles is easy; just
> clear the EDGES map and the output moves back to only using only `|`
> characters. I don't know how easy it'll be to put the last step
> (shortening missing-parent edges) behind a feature flag.

I was mostly worried about the edge shapes.

Is there an easy to compare spot for missing-edge parents? (The
graphlog changes are long and not particularly fun to read)