Widget HTML containers have visibility:hidden; when an error is rendered

[cpsievert]

Discovered via rstudio/shiny#4115 (comment)

For example, note how, because of the req(), no spinner appears. The underlying reason is that htmlwidgets.js adds visibility:hidden; to the widget container when the error gets rendered, and doesn't clear that style until the next value gets rendered.

library(shiny)
library(plotly)

ui <- fluidPage(
  useBusyIndicators(),
  actionButton("run_plotly", "Run plotly"),
  plotlyOutput("p")
)

server <- function(input, output, session) {
  output$p <- renderPlotly({
    validate(need(input$run_plotly, "Please run plotly"))
    Sys.sleep(3)
    plotly::plot_ly()
  })
}

shinyApp(ui, server)

[cpsievert]

I think this is just the way it needs to be done unfortunately