Archive link to previous discussion:
https://marc.info/?l=git&m=146331754420554&w=2

On 20 May 2016 at 18:12, Noam Postavsky <npostavs@users.sourceforge.net> wrote:

> Looking at the coloured output, for some octopus merges where the
> first parent edge immediately merges into the next column to the left,
> col_num should be decremented by 1 (otherwise the colour of the "-."
> doesn't match the rest of that edge).
>
> | | *-.
> | | |\ \
> | |/ / /
>
> For the other case where the first parent edge stays straight, the
> current col_num computation is correct.
>
> | *-.
> | |\ \
> | | | *
>
> I'm not sure how to distinguish these cases in the code though. Is it
> enough to just compare against graph->num_new_columns?

I was recently reminded of this, here's a patch which does that.