fontforge/fontforge — pull request #1571 by monkeyiq (2014-07-26 07:24:28+00:00)
Title: Make the rendering of the stroke outline *almost* transparent when in preview mode.

If you try to make it fully transparent then you will find that it is fully opauqe instead.
So it is now at 1/255 = 0.4% opaque, which I can't see when rendered even if the colors
are bright green or red.