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breaking change: alpha now impacts the line of stat_ based geoms. #1523
This has changed following #1371, and I think (personally) that this is the wrong decision.
I would vote for reverting this behavior, as I'm pretty sure it's breaking more graphing code now than it would if reverted for 2.1.
The downside of the old behavior is that you need to change the color directly if you want something lighter.
referenced this issue
Jan 27, 2016
To answer requests from @dhimmel and others who need lines representing densities with alpha,