subplot - merging titles following ggplotly conversion

data(faithful)

p1 <- plotly::ggplotly(
  ggplot(faithful, aes(x = eruptions)) + 
    geom_histogram(bins = 20) + 
    theme_minimal()  + 
    labs(title = "A.")
)

p2 <- plotly::ggplotly(
  ggplot(faithful, aes(x = waiting)) + 
    geom_histogram(bins = 20) + 
    theme_minimal()  + 
    labs(title = "B.")
)

pl <- subplot(p1, p2, nrows = 1, titleX = TRUE)

## note  that changing to labs(tag = "A.") results in loss of the 'tag' at the ggplotly function.  

I am creating a gglot (histogram, in this case) which includes a sub-panel label. I want to then convert to a plotly figure using the plotly::ggplotly function. The label is transmitted faithfully to each of p1 and p2. However, when combining these into a subplot, the label seems to be merged . I lose the 'A.' label on the first plot p1, generally. The titleX option does not prevent this from occurring.

Commencez par l’exemple reproductible avec les données faithful utilisant ggplotly et subplot, puis suivez la manière dont subplot combine les titres de p1 et p2 lorsque titleX est activé. Confirmez le comportement pour labs(title = "A.") et labs(title = "B.") ; c’est terminé lorsque les deux libellés restent visibles après la conversion et la combinaison.