Cannot set stackplot linewidth=0 when writing to pdf

[kennethdamica]

Setting linewidth=0 works fine when using show() or writing to a png, but linewidth seems to default to 1 when writing to a PDF.

Here is a demo of the bug:
https://gist.github.com/kennethdamica/9646582

[WeatherGod]

The PDF spec does not allow for a zero width line (or even less than 1
width lines), so many viewers will force a minimum width of one on display.
We have run into this issue with users specifying linewidths like 0.5 and
having it display like a 1.0 in PDF viewers. Now, for the case of a
zero-width line, I would imagine that it shouldn't be drawn at all.

[mpharrigan]

Hi,
I'm having this issue with scatter as well, and it is very frustrating

[tacaswell]

For scatter you might be able to get away with setting the markeredgecolor to be the same as the marker face color.

[mpharrigan]

Setting edgecolor to 'none' also seems to work

[jkseppan]

I think this is fixed by #3485, specifically commit 3a015fa.