[PATCH 2 of 6] graph: draw edges to obsolete changesets as dashed

[Sean Farley]

Andrew Shadura <andrew at shadura.me> writes:

> # HG changeset patch
> # User Sean Farley <sean.michael.farley at gmail.com>
> # Date 1404932959 18000
> #      Wed Jul 09 14:09:19 2014 -0500
> # Node ID 1d08fb9cd850269f7f771e54f3e9496d49fcb102
> # Parent  011e77e80ae34ba9a19b8591c78959feee5934b9
> graph: draw edges to obsolete changesets as dashed

I was actually thinking of making these show as solid lines but drawing
a dash between the precursor / successor changesets. The wrench I ran
into was drawing the dotted line between pages.