[BUG] Hair alpha dithering glitches in 4.17

Gomo
Thu, 10 Aug 2017 13:44:58 +0000
Rendering

After switching from 4.15 to 4.17 we noticed that hair, especially short hair, is rendering much worse.
Dither glitches appear in places where opacity is set to 0.
Below comparison of rendering hair on photorealistic human sample (lef 4.15, right 4.17):

And how it looks like in our case:

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