hadley/gtable — pull request #28 by kohske (2012-07-19 13:16:47+00:00)
Title: replace childrenvp by viewport.

This is not a real pull request, but just a rough idea, relevant to #26 and #27.

Now I don't use childrenvp and vpTree, this is too complicated.
Instead, as @wch suggested, I use hooks, ie, preDraw/preDrawDetails, and push viewport there.