matplotlib/matplotlib — pull request #1973 by mdboom (2013-05-03 16:09:38+00:00)
Title: Collection's contains method doesn't honour offset_position attribute

The contains method of Collection objects doesn't honour the newly introduced _offset_position attribute, making it fail when _offset_position == "data".
I noticed this when trying to add a pick_event handler to a hexbin plot, which does not work properly with matplotlob 1.2.x