tidyverse
Issue a message when fill aesthetic is used with GeomPoint and shape is not "filled"
I've spend an hour or so of ggplot2 debugging to find out that fill aesthetics is simply ignored when shape of the point is not 21:25, i.e., not "filled". grid::grid.point, which is used, documents this case quite well, but ggplot2 gives a hint only through the example that could be "hidden" from the user that struggles with, e.g., boxplot ouliers fill modification (as in my case).
I would hugely appreciate to get warning/message that inform the user he or she is demanding something that won't work as intended, like it is the case when I use scale_alpha_* with continuous variable.
While I empathise with the problem, I don't think a check like this is suitable for scatterplots that have in the millions of points as such a check slows down plotting quite a bit. I've argued against input validation here but I think the documentation could be a bit more explicit.
