When calling on geom_area tooltip activates when hovering over line, not area

Calling ggplotly on ggplot invoking geom_area results in a plot in which the tooltip activates when hovering over the "lines" separating the areas. I would have expected the tooltip to activate when hovered over the filled area.

Here is some reprex

library("ggplot2")
library("plotly")

#create the data
data <- data.frame('year' = rep(1981:2020, 2),
           "type" = rep(c("a", "b"), 40),
           "value" = runif(80))

#Generate the plot
ggplotly(
  ggplot(data, 
         aes(x = year, y = value, fill = type)) +
    geom_area(col = "grey", size = 0.5) #set the line col so that you can see the activation when close to the line
)
  

I don't see any open or closed issues on this. Online, I only see this solution: https://stackoverflow.com/questions/47331323/ggplotly-and-geom-area-display-informations-when-hovering-over-an-area-not-a, which seems convoluted.

Regardless of that solution, I would still assume the expected behavior for geom_area is for the tooltip to activate over the area, not the line.

首先使用 R、ggplot2 和 plotly 运行提供的 reprex，然后检查 ggplotly 转换中 geom_area 的悬停行为。完成的标准是：将鼠标悬停在填充区域上时会激活工具提示，而不仅仅是在分隔各区域的线条上悬停时激活。