How do you set different scale limits for different facets?

Question

Some sample data:

dfr <- data.frame(
  x = rep.int(1:10, 2),
  y = runif(20),
  g = factor(rep(letters[1:2], each = 10))
)

A simple scat

Answer 1

I don't think this is possible yet in ggplot2. This discussion from January suggests the issue is under consideration.