title: PyCharm code completion: how to prevent space key and "dot" from committing lookup item
body: <p>How does one disable the space key from committing the suggestion when using code completion?</p>
  
  <p>If I attempt to name something "req" for example, when I'm done typing, and enter a "space," I wind up with "request" instead -- this being just one example.</p>
  
  <p>I don't see it anywhere in the keymap, and have seen this mentioned in other places without any apparent solution.</p>