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UI on verticalTabPanel does not update #237

@bobbeltje

Description

@bobbeltje

The UI of a verticalTabPanel does not seem to trigger an update when it should. Curiously, it works for the first verticalTabPanel, but not for the second one. Here is an example:

library(shiny)
library(shinyWidgets)
library(DT)

ui <- navbarPage(
  title='nav',
  tabPanel(
    title='nav1',
    verticalTabsetPanel(
      verticalTabPanel(
        title='page_1',
        actionButton('load_table1', 'Load table'),
        dataTableOutput('tbl1')
      ),
      verticalTabPanel(
        title='page_2',
        actionButton('load_table2', 'Load table'),
        dataTableOutput('tbl2')
      )
    )
  ),
  tabPanel(title='tab2', 'empty')
)
server <- function(input, output){
  show_tbl1 <- reactiveVal(F)
  show_tbl2 <- reactiveVal(F)
  observeEvent(input$load_table1, ignoreInit=T, {
    show_tbl1(T)
  })
  observeEvent(input$load_table2, ignoreInit=T, {
    show_tbl2(T)
  })
  output$tbl1 <- renderDataTable({
    if (!show_tbl1()) return(NULL)
    datatable(data.frame(x=1:10))
  })
  output$tbl2 <- renderDataTable({
    if (!show_tbl2()) return(NULL)
    datatable(data.frame(x=1:10))
  })
}
shinyApp(ui, server)

Clicking the action buttons on page_1 and page_2 should render a table on the vertical tabs, but it only works on page_1. For the second one to be triggered you need to navigate to tab2 of the navbar and back to tab1.

I noticed this is an issue in shiny 1.4.0, but not in 1.3.2 or 1.2.0.

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