title: Show ggplot graphs in new window by default with X11
body: <p>I'm on Ubuntu 18.04 using RStudio 1.4. I use the external device X11 to see graphics because I often need to have multiple plots shown at a time. I would like to have ggplot show each plot in a new device by default, as if a ggplot call was always preceded by a call to <code>dev.new()</code>. I'm fine with having to do a bunch of manual window closing. Is there a way to have that default behavior? Below is a MWE.</p>
  <pre><code>library(tidyverse)
  options(device = &quot;X11&quot;)
  
  # regular default behavior, where a new ggplot call will overwrite the plot in the active device (if any)
  mtcars %&gt;% 
    ggplot(aes(x = cyl, y = mpg)) + 
    geom_point()
  
  # desired default behavior, where a new device is created with the ggplot call
  dev.new(); mtcars %&gt;% 
    ggplot(aes(x = cyl, y = mpg)) + 
    geom_point()
  </code></pre>