Changing `position` value in `scale_` interacts strangely with `coord_trans()`

[courtiol]

Applying any transformation using coord_trans() modifies what the argument position does in scale_:
(notice that only the title of the axis is sent to the top and no longer the labels when coord_trans() is used)

library(ggplot2)
  
packageVersion("ggplot2")  ## note: current devel does also behave in the same way
#> [1] '3.3.5'

ggplot(data = iris) +
  geom_point(aes(y = Sepal.Length, x = Species)) +
  scale_x_discrete(position = "top")

ggplot(data = iris) +
  geom_point(aes(y = Sepal.Length, x = Species)) +
  scale_x_discrete(position = "top") +
  coord_trans(y = "identity")

^{Created on 2021-07-08 by the reprex package (v2.0.0)}

The same goes for the left/right positions.

[teunbrand]

This might be related to #3959, but because "Species" is on top it would suggests that facets are aware of the position but coords might not be.

[thomasp85]

Potentially also related to #4650

[thomasp85]

@paleolimbot all of these issues seems to be related to the fact that only coord_cartesian()was moved over to the new axis guide generation pipeline... are you up for moving the remaining coords?

[yutannihilation]

This will be fixed by #3972.

devtools::load_all("~/GitHub/ggplot2/")
#> ℹ Loading ggplot2

ggplot(data = iris) +
  geom_point(aes(y = Sepal.Length, x = Species)) +
  scale_x_discrete(position = "top") +
  coord_trans(y = "identity")

^{Created on 2022-07-08 by the reprex package (v2.0.1)}