dynamicTicks = TRUE with facet_wrap() and categorical axis

It seems that dynamicTicks=TRUE in ggplotly is working for categorical data only when the plot is not faceted. Is there a reason for that or is this part of the bug you were working on here: https://github.com/ropensci/plotly/issues/860?

library("ggplot2")
library("plotly")

p1 <- ggplot(mtcars) + 
  geom_line(aes(x=as.factor(hp), y=mpg, group=1))


p2 <- ggplot(mtcars) + 
      geom_line(aes(x=as.factor(hp), y=mpg, group=1)) +
      facet_wrap(vars(gear))

#non faceted plot works
ggplotly(p1, dynamicTicks = TRUE)

#faceted plot does not work
ggplotly(p2, dynamicTicks = TRUE)

运行提供的 R 示例，针对带有 dynamicTicks=TRUE 的 ggplotly()，比较未分面化的 p1 与 facet_wrap() 版本 p2。从此入口点追踪 dynamicTicks 和 facet_wrap() 的处理；完成标准是：分类轴在分面图中与未分面图一样一致地使用动态刻度。