matplotlib/matplotlib — pull request #576 by cgohlke (2011-11-10 01:50:26+00:00)
Title: Fix slider widget polygon

This attempts to fix the Slider widget. When moving the sliders in slider_demo.py the blue polygons change to triangles. Similar, if valmin == valinit when the Slider widget is initialized, the polygon is truncated and becomes a triangle. Not sure yet if this patch has unwanted side effects.