fix nudging with multiple values. closes #2977

[clauswilke]

Fix spurious warning in position_nudge(), as described in #2977.

library(ggplot2)

df <- data.frame(
  x = c(1,3,2,5),
  y = c("a","c","d","c")
)

ggplot(df, aes(x, y)) +
  geom_point() +
  geom_text(aes(label = y), nudge_y = c(-0.1, 0.1, -0.1, -0.1))

^{Created on 2018-12-05 by the reprex package (v0.2.1)}

[yutannihilation]

This looks good to me!

(I've got to think if we should check the length of the nudge params, but let's discuss it later)

[clauswilke]

Ok. I'll merge this now, since it's such a small change and really was an oversight when I wrote the code originally.

[lock]

This old issue has been automatically locked. If you believe you have found a related problem, please file a new issue (with reprex) and link to this issue. https://reprex.tidyverse.org/