Outliers in boxplot with two grouping variables occur in the middle (and have unexpected color)

[zross]

@jbkunst this issue is probably a variation on #519. I'm not sure if it is expected or wanted behavior but I wouldn't think so. You can see that with one group_var it works fine but with the second, group_var2 the outliers occur in the middle and in the example below are in orange and green.

I would expect the outlier to be associated with one of the six boxes rather than in the middle of the two.

Using group_var

library(highcharter)

mtcars$mpg[c(1, 3)] <- 60 #add outliers

dat <- data_to_boxplot(
  mtcars,
  mpg,
  group_var = cyl,
  #group_var2 = vs,
  add_outliers = TRUE
) 

highchart() %>%
  hc_xAxis(
    type = "category"
  ) %>%
  hc_add_series_list(dat)

Using group_var and group_var2

mtcars$mpg[c(1, 3)] <- 60 #add outliers

dat <- data_to_boxplot(
  mtcars,
  mpg,
  group_var = cyl,
  group_var2 = vs,
  add_outliers = TRUE
) 

highchart() %>%
  hc_xAxis(
    type = "category"
  ) %>%
  hc_add_series_list(dat)

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