title: Xtext editor to insert single proposals automatically without showing content assist popup
body: <p>In my Xtext editor I want to enable <strong>insert single proposals automatically</strong> by default.
  In essence what want is to have auto completion when there is only one matching choice to show up in content assist when we hit Ctrl-Space. </p>
  
  <p>In eclipse(java editor) this can be configured from <em>Windows->Preferences</em> go to <em>Java->Editor->Content Assist</em> page and select "insert single proposals automatically" checkbox.</p>