matplotlib/matplotlib — pull request #1418 by jenshnielsen (2012-10-20 16:55:38+00:00)
Title: Tables: Fix get_window_extent for table 

This allows a table to be added to bbox_extra_artists.
See https://github.com/ipython/ipython/issues/2508

Got rid of bbox_all and replaced it with Bbox.union.
Furthermore the get_window_extent is a method on the cells not the key of the cell
so change that to avoid an attribute error.