Updating `scale` instead of replacing

[jbengler]

Hi Teun!

I’ve always wondered about this. Is there a way to update a scale instead of replacing it, similar to how theme() works?

If not, would there be a way to implement this?

library(ggplot2)

p <- 
  mtcars |> 
  ggplot(aes(disp, drat)) +
  geom_point()

# themes are updated
p + 
  theme(panel.grid.major = element_line(color = "pink")) + 
  theme(panel.grid.minor = element_line(color = "blue"))

# scales are replaced
p +
  scale_x_continuous(limits = c(100, 200)) +
  scale_x_continuous(trans = "log10")

Best
Jan

[teunbrand]

Hi Jan!
You might be interested in #6196, which roughly follows the pattern you describe. If I'm understanding you correctly, this issue is in essence a duplicate of #4269 and we can continue discussion over at there.

[jbengler]

That is great! PR #6196 is exactly what I had in mind.
Sorry for the duplicate. I have to get better in finding relevant issues and PRs 🙄