It looks like this will be fixed by #7976, in the case where the edgecolor argument is specified to fill_between to choose the colour of the hatch.

Nice! Thanks for the quick update :)

This is now fixed in master and 2.0.1

Is there no way to control the hatch transparency separately?

At the lowest level it can be controlled, but currently there is no user interface to this in the classes we ship. If you need a different color hatch + edge, I suggest using two over-lapping artists.

Is there any update about separate transparency control? If I use two artists to get desired effect, I have problem with legend.

@usiu5555 See the last example of https://matplotlib.org/users/legend_guide.html#legend-handlers that section for how to handle merging multiple artists into a single legend entry.

There has not bee any progress on threading the alpha control of the hatch through the Artist classes, would you be interested in looking into that @usiu5555 ?

@tacaswell Thank you, that helped, and was much easier than I expected.

Well, sounds like a challenge, but sadly, because of many reasons, I can't.