Cannot have more than one shape after subplot()

I guess this is related to #1333

Here is the issue: it doesn't seem possible to have more than one shape after subplot() is called. Applying the shapes to the individual plots work, though.

reprex that works:

library(plotly)

p1 <- plot_ly(mtcars, x = ~mpg, y = ~hp) %>% 
  layout(
    shapes = list(
      list(
        type = "line", 
        line = list(color = "#5681c4", dash = "dot"),
        x0 = 20, 
        x1 = 20,
        y0 = 0,
        y1 = 1,
        yref = "paper"
      ),
      list(
        type = "line", 
        line = list(color = "#5681c4", dash = "solid"),
        x0 = 30, 
        x1 = 30,
        y0 = 0,
        y1 = 1,
        yref = "paper"
      )
    )
  ) %>%
  config(editable = TRUE)

p2 <- plot_ly(mtcars, x = ~mpg, y = ~drat) %>% 
  layout(
    shapes = list(
      list(
        type = "line", 
        line = list(color = "#5681c4", dash = "dot"),
        x0 = 20, 
        x1 = 20,
        y0 = 0,
        y1 = 1,
        yref = "paper"
      ),
      list(
        type = "line", 
        line = list(color = "#5681c4", dash = "solid"),
        x0 = 30, 
        x1 = 30,
        y0 = 0,
        y1 = 1,
        yref = "paper"
      )
    )
  ) %>%
  config(editable = TRUE)

subplot(p1, p2, nrows = 2)

reprex that does not work:

library(plotly)

p1 <- plot_ly(mtcars, x = ~mpg, y = ~hp)

p2 <- plot_ly(mtcars, x = ~mpg, y = ~drat)

subplot(p1, p2, nrows = 2) %>% 
  layout(
    shapes = list(
      list(
        type = "line", 
        line = list(color = "#5681c4", dash = "dot"),
        x0 = 20, 
        x1 = 20,
        y0 = 0,
        y1 = 1,
        yref = "paper"
      ),
      list(
        type = "line", 
        line = list(color = "#5681c4", dash = "solid"),
        x0 = 30, 
        x1 = 30,
        y0 = 0,
        y1 = 1,
        yref = "paper"
      )
    )
  ) %>%
  config(editable = TRUE)

reprex with only one shape - it works:

library(plotly)

p1 <- plot_ly(mtcars, x = ~mpg, y = ~hp)

p2 <- plot_ly(mtcars, x = ~mpg, y = ~drat)

subplot(p1, p2, nrows = 2) %>% 
  layout(
    shapes = list(
      type = "line", 
      line = list(color = "#5681c4", dash = "dot"),
      x0 = 20, 
      x1 = 20,
      y0 = 0,
      y1 = 1,
      yref = "paper"
    )
  ) %>%
  config(editable = TRUE)

Any thoughts?

まず issue 内の動作する reprex と失敗する reprex を実行し、各 plot に渡される shapes と subplot() の後に追加される shapes を比較します。subplot() がどのように plot を結合し、その後の layout(shapes = ...) の呼び出しがどのように処理されるかを追跡します。両方の shapes が subplot 上にレンダリングされ、config(editable = TRUE) で編集可能な状態を維持できれば完了です。