No dashed or dotted grid lines with ggplotly

It seems that ggplotly cannot handle dashed or dotted grid lines. They always default to solid grid lines.

No matter whether I am specifying the general option panel.grid or a specific one like panel.grid.major.y, they always become solid with ggplotly.

library(ggplot2)
library(plotly)

# Dotted and dashed grid lines appear with ggplot2
p <- ggplot(mtcars, aes(disp, mpg)) +
  geom_point() +
  theme(panel.grid = element_line(colour = "red",
                                  linetype = "dotted")) # same issue if "dashed"

p

# However, with ggplotly they become solid
ggplotly(p)

まず、ggplot2 と ggplotly を使って issue の R 例を実行し、次に panel.grid と panel.grid.major.y の設定がどのように変換されるかを追跡します。完了条件は、破線および点線のグリッド線が ggplotly の出力でも破線または点線のまま維持され、元の ggplot2 プロットと一致することです。