pie chart color mapping doesn't work properly when aggregating data

This seems to be maybe a partial regression related to #1375. Using similar code to that issue:

library(plotly)
plot_ly(mtcars[c(1,3,5), c("cyl", "drat")], labels = ~cyl, values = ~drat, type = 'pie', 
        marker = list(colors = c("cyan", "magenta", "black"))) %>%
    layout(xaxis = list(showgrid = FALSE, zeroline = FALSE, showticklabels = FALSE),
           yaxis = list(showgrid = FALSE, zeroline = FALSE, showticklabels = FALSE))

plot_ly(mtcars[, c("cyl", "drat")], labels = ~cyl, values = ~drat, type = 'pie', 
        marker = list(colors = c("cyan", "magenta", "black"))) %>%
    layout(xaxis = list(showgrid = FALSE, zeroline = FALSE, showticklabels = FALSE),
           yaxis = list(showgrid = FALSE, zeroline = FALSE, showticklabels = FALSE))

It seems to apply the default palette color to the first group.

Interestingly, if you bang it in there a few more times it shows (though with different order).

plot_ly(mtcars[, c("cyl", "drat")], labels = ~cyl, values = ~drat, type = 'pie', 
        marker = list(colors = c("cyan", "magenta", "black", "magenta", "magenta"))) %>%
    layout(xaxis = list(showgrid = FALSE, zeroline = FALSE, showticklabels = FALSE),
           yaxis = list(showgrid = FALSE, zeroline = FALSE, showticklabels = FALSE))

まず、提供されている2つの plot_ly の例を mtcars で実行し、集約データと非集約データで円グラフのスライスの色を比較します。issue #1375 を確認し、円グラフの色の処理を追跡します。提供された色が追加の色エントリを必要とせず、正しいグループに一貫して対応付けられれば完了です。