matplotlib/matplotlib — pull request #644 by jkseppan (2011-12-29 17:20:43+00:00)
Title: Issue 621

Make the pdf and ps backends use the same logic for marker-edge stroking as they use for other paths; the problem was that in the marker case the backends did not check the edge width against 0, and in PostScript and PDF a zero-width line means a line at the minimum possible width, but in other backends it seems to mean a line that is not drawn at all.