Could palettes specific to geoms be set in the theme?

[davidhodge931]

Wondering if there is any possibility to set colour/fill palettes in the theme on a geom basis?

 ggplot2::update_theme(
  histogram.palette.colour.discrete = c("darkred", "darkblue", "darkgreen"),
  histogram.palette.fill.discrete = c("red", "blue", "green"),
  line.palette.colour.discrete = c("red", "blue", "green"),
 )

Apologies if this has already been raised somewhere - I had a search, but couldn't find anything

[teunbrand]

There are no layer specific scales in ggplot2, so it also wouldn't be possible to set them via the theme.