title: How to discard the completion suggestion
body: <p>I've just changed my 'completeopt' setting back from:</p>
  
  <pre><code>set completeopt = preview,menuone,longest
  </code></pre>
  
  <p>to the default:</p>
  
  <pre><code>set completeopt = preview,menuone
  </code></pre>
  
  <p>After a long while of using it as it was, I have decided that I
  prefer having the first entry selected by default.</p>
  
  <p>I do have one annoyance though. I would like to be able to try to
  complete, if the match I'm looking for isn't in the list then
  discard the suggested completion and revert to my original text.
  How is this done?</p>
  
  <p>I seem to remember from a distant past that this behaviour exists
  but randomly bashing buttons hasn't proved fruitful and searching
  isn't working out for me.</p>
  
  <p>Thanks for any help.</p>