`geom_violin()` warns that `weight` aesthetic dropped during statistical transformation

[AroneyS]

Similar to #5053, geom_violin() also warns that weight is dropped, although it appears to be used as expected.

Reprex: (note that the two geom_violin() calls produce different outlines)

library(ggplot2)

ggplot(mtcars, aes(wt, mpg)) +
  geom_point(aes(size = cyl)) +
  geom_violin(aes(weight = cyl)) +
  geom_violin()

[teunbrand]

Thanks for the report! I can confirm the bug. I really thought I had fixed this for most stats, but this one must've slipped the net.