ggupset breaks with version 3.3.0

[const-ae]

Hi,

I noticed yesterday that with the new version of ggplot, my extension ggupset breaks when I add a scale_x_mergelist().
On the positive side, the main functionality of the package is still intact and my replacement combination matrix axis still works.

However, I have a helper function scale_x_mergelist() that converts a list column into a character vector with paste(..., collapse = "-"). Previously, the collapsed string was shown on the x-axis, now it is blank:

library(ggplot2)
library(ggupset)
ggplot(tidy_movies, aes(x = Genres)) +
  geom_bar() +
  scale_x_mergelist(sep = "-")

^{Created on 2020-03-29 by the reprex package (v0.3.0)}

Before the change the plot looked like this:

From my preliminary investigations, I think the issue might be related to #3398. However, I cannot figure out how to adapt the code of my package to make it work again.

[clauswilke]

I assume this will help: haleyjeppson/ggmosaic#41 (comment)
See also: haleyjeppson/ggmosaic#42
(Though I would probably just bump the version requirement for ggplot2 and not bother with fixing things for older version of ggplot2.)

[const-ae]

Thank you for the quick reply. Adding guide = ggplot2::waiver() fixed the issue :)