Legend order in scatter plot ignored when frame animation is used

Hello everyone!

I'm currently working on a dashboard for monitoring in R and would like use Plotly's animated scatter plot, which works like a charm except for the legend order. Indepentent from how I define the order within the code, the order defaults to alphabetical.

Here's a code to reproduce the issue based on the gapminder dataset. To demonstrate the issue, I've reordered the continent factor variable by reversing the levels and it still shows in alphabetical order. The same happens, when I hardcode the order into the levels parameter.

library(tidyverse)
library(plotly)
library(gapminder)

gapdf <- gapminder

fig <- gapdf %>%
  mutate(
    continent = factor(continent, levels = rev(levels(continent)))
  ) %>% 
  plot_ly(
    x = ~gdpPercap,
    y = ~lifeExp,
    size = ~pop,
    color = ~continent,
    frame = ~year,
    text = ~country,
    hoverinfo = "text",
    type = 'scatter',
    fill = ~'',
    mode = 'markers'
  )
fig <- fig %>% layout(
  xaxis = list(
    type = "log"
  )
)
fig <- fig %>% animation_opts(
  1000, easing = "elastic", redraw = FALSE
)
fig <- fig %>% animation_button(
  x = 1, xanchor = "right", y = 0, yanchor = "bottom"
)
fig <- fig %>% animation_slider(
  currentvalue = list(prefix = "YEAR ", font = list(color="#CC0033"))
)

fig

When "frame" and its corresponding animation commands are excluded, the legend order works as intended:

library(tidyverse)
library(plotly)
library(gapminder)

gapdf <- gapminder

fig <- gapdf %>%
  mutate(
    continent = factor(continent, levels = rev(levels(continent)))
  ) %>% 
  plot_ly(
    x = ~gdpPercap,
    y = ~lifeExp,
    size = ~pop,
    color = ~continent,
    text = ~country,
    hoverinfo = "text",
    type = 'scatter',
    fill = ~'',
    mode = 'markers'
  )

fig

Reversing the order is only possible through adjusting the traceorder of the legend, but I would like to use the order of the levels as provided by the data, which is not alphabetical or reversed alphabetical in 99,9% of my cases, so this workaround won't help.

If anyone knows a proper workaround, I would highly appreciate it!

Kind regards and have a nice day everyone.

まず、提供された R の再現コードを gapminder データセットで実行し、アニメーション付きプロットとアニメーションなしのプロットを比較します。frame animation が continent の factor levels をどのように処理するかを追跡します。アニメーション付き散布図が、traceorder の回避策を必要とせずにデータで定義された凡例の順序を保持すれば完了です。