geom_trans() doesn't work with geom_dumbbell()

[morrisseyj]

Trying to use geom_dumbbell() on plot with log transformed x and y axes. Throws error:

Error in [.data.frame(df, , c("alpha", "colour", "size", "linetype")) :
undefined columns selected

Here is an example:

#create the data
df <- data.frame(x = c(1, 2, 3, 100),
                 xend = c(2, 4, 6, 110),
                 y = c(1, 2, 3, 100)) 

#Try the plot with coord_transform
library('ggalt')
ggplot(df, aes(x = x, xend = xend, y = y)) + 
  geom_dumbbell() + 
  coord_trans(x = 'log2', y = 'log2')

Error:

Error in [.data.frame(df, , c("alpha", "colour", "size", "linetype")) :
undefined columns selected

If i try coord_trans(x = 'log2', xend = 'log2', y = 'log2), I get the error:

Error in coord_trans(x = "log2", xend = "log2", y = "log2") :
unused argument (xend = "log2")

Question is more fully articulated here: https://stackoverflow.com/questions/65616356/geom-dumbbell-with-coord-trans?noredirect=1#comment116014912_65616356