Add a minor note about the difference of the unit of size to FAQ

[yutannihilation]

I think it's a common case that the user wants to customize both the size of theme and that of geoms. So, probably this FAQ should have some mention about the difference of the unit.

https://ggplot2.tidyverse.org/articles/faq-customising.html#fonts

[teunbrand]

It might also be good to mention hat we've added a size.unit argument to geom_text() to switch the behaviour in #5260.

[thomasp85]

@yutannihilation can you brush this up so we can include it in the next release

[yutannihilation]

Thanks, but I'm yet to figure out how I can fit @teunbrand's comment into the FAQ; while size.unit is a variable tip, I think the FAQ talks about how to change the default size, and size.unit is not what the user can update by update_geom_defaults() (am I correct here?). Also, size.unit cannot change the fact that GeomLabel$default_aes$size is stored as mm. Maybe it's less confusing not to mention size.unit here? Any ideas?

[teunbrand]

am I correct here?

Yeah it is a parameter, not an aesthetic.

Any ideas?

Maybe mention here that 'the default size is in mm' and add to the vignette it links to that there is a metric switch?

[yutannihilation]

Thanks. How about this one?

[teunbrand]

Yes I think this looks good :)

[yutannihilation]

Thanks!