ConditionalPanel + Plot Shiny Resizing Bug

server.R

library(shiny)

shinyServer(function(input, output) {
   
  output$distPlot <- renderPlot({
    print("Plotting");
    Sys.sleep(1)
    # generate and plot an rnorm distribution with the requested
    # number of observations
    dist <- rnorm(input$obs)
    hist(dist)
  })
  
  output$content <- renderTable({
    data.frame(a=1:3, b=2:4)
  })
  
})

ui.R

library(shiny)

shinyUI(pageWithSidebar(
  
  # Application title
  headerPanel("New Application"),
  
  # Sidebar with a slider input for number of observations
  sidebarPanel(
    conditionalPanel("1 == 1",
      sliderInput("obs", 
                "Number of observations:", 
                min = 1, 
                max = 1000, 
                value = 500))
  ),
  
  # Show a plot of the generated distribution
  mainPanel(
    tabsetPanel(
      tabPanel("Tab1", 
               plotOutput("distPlot")
      )
    )
  )
))