Issue when specifying both the size and color mapping in a scatter plots

Hi,

I can not manage to specify both the size and the color mapping with completely satisfactory results.

If I specify the size mapping globally:

library(plotly)
df <- data.frame(x = 1:12, y = 1:12, s = 1:12, g = rep(c("A", "B", "C"), 4))

plot_ly(data = df, x = ~x, y = ~y, size = ~s, color= ~g)%>% 
  add_markers()

I have a perfect plot but I suffer from the spurious line.width warning already mentioned in https://github.com/ropensci/plotly/issues/1367

If I specify the size mapping in the marker itself:

plot_ly(data = df, x = ~x, y = ~y, color= ~g)%>% 
  add_markers(marker = list(size = ~s))

The sizes are wrong: it seems there is an ordering by group within plotly which is not used in the markers.

Indeed, sorting the data.frame according to the colors fixes the issue:

df_sorted = df[order(df[['g']]), ]
plot_ly(data = df_sorted, x = ~x, y = ~y, color= ~g)%>% 
  add_markers(marker = list(size = ~s))

Let me know how I can help!

从使用 plot_ly() 和 add_markers() 的两个未排序示例开始，然后将它们的标记大小行为与已排序 data.frame 示例进行比较。跟踪颜色分组和标记大小映射是如何对齐的，并验证未排序数据在没有报告的 line.width 警告的情况下保留预期大小。