title: Vertical line is not shown on my HoloViews scatter plot because it's outside the x-range of my scatterplot
body: <p>I have a scatter plot and want to add a vertical line to it as a marker.</p>
  
  <p>However the scatter plot has x-range 0 to 2, but my vertical line is at x-range 6, so it's falling outside of the x-range of my scatter plot and not shown automatically.</p>
  
  <p>What can I do to make my vertical line shown regardless of the x-ranges of my plot?</p>
  
  <p><br>
  <strong>Sample code:</strong></p>
  
  <pre><code>import holoviews as hv
  hv.extension('bokeh')
  
  # my vline is not shown automatically because it's
  # outside the range of my hv.Curve()
  hv.Curve([[0,3], [1,4], [2,5]]) * hv.VLine(6)
  </code></pre>
  
  <p><br>
  <strong>Example plot (which doesnt show Vline):</strong></p>
  
  <p><a href="https://i.stack.imgur.com/dhOd8.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/dhOd8.png" alt="line plot without extra vertical line"></a></p>