theme_void seems to overwrite guides = "collect"

[tjebo]

When using theme_void, guides = "collect" seems to stop working. Maybe theme_void is overwriting themes set by guides = "collect"? Also, global setting such as & theme(legend.justification = "...") seems to fail in this case.

I stumbled upon this on answering a question on stackoverflow. Interestingly, guides between theme_void plots are being collected. (see last plot in this issue, and the SO example plot)

library(ggplot2)
library(patchwork)

p1 <- ggplot(mtcars) +
  geom_point(aes(mpg, disp, colour = mpg)) +
  scale_color_continuous(limits = c(0,30)) 

p2 <- ggplot(mtcars) +
  geom_point(aes(hp, wt, colour = mpg)) +
  scale_color_continuous(limits = c(0,30)) 


p1 + p2 + 
  plot_layout(guides = "collect")

p1 + p2 + theme_void() + 
  plot_layout(guides = "collect")

It works with other themes

p1 + p2 + theme_classic() + 
  plot_layout(guides = "collect")

When both plots are theme_void, it works.

p1 + theme_void() + p2 + theme_void()+
  plot_layout(guides = "collect")

^{Created on 2021-02-21 by the reprex package (v1.0.0)}