@cpsievert @KasperSkytte
Please could this change be reviewed and included?
It is a real pain to have this unnecessary warning appearing all the time.

Yes, sorry, would you mind adding a NEWS.md item as well? Thanks!

Thanks! I've added this to the development version section of the News.md file. Hopefully that's as expected.

Thank you! Does this also avoid the warning that is send for the related boxgroupgap option for layout, and, similarly, boxgap for non-grouped boxplots? This is also an issue with barplots (type='bar'), where bargroupgap also trigger an unwarranted warning.

This is also mentioned #1956 and #2406 .

Reproducible example for simple boxplots and grouped barplots shown below:

library(plotly)
fig <- plot_ly(ggplot2::diamonds, x = ~cut, y = ~price, type = "box")
fig <- fig %>% layout(boxgap = 0.8)
fig

library(plotly)
library(dplyr)
fig <- plot_ly(ggplot2::diamonds %>% count(cut, clarity), x = ~cut, y = ~n, color = ~clarity, type='bar')
fig %>% layout(bargroupgap = 0.5)

No, do you want to submit a PR?