matplotlib/matplotlib — pull request #1811 by davidtrem (2013-03-06 10:22:29+00:00)
Title: MultiCursor with additionnal optionnal horizontal bar

This pull request proposed an improved MultiCursor widget that allows to select either vertical (default) and/or horizontal cursor lines. Previous Multicursor was vertical bar only.
The default behavior of Multicursor is fully preserved by this pull request.