title: Vim plugin for showing possible next keys?
body: <p>is there a vim setting or plugin to show the possible next keys (probably with comment)? I would like to have something like this for my <code>&lt;leader&gt;</code> mappings and it would be a huge benefit for beginners.</p>
  
  <p>Workflow:</p>
  
  <pre><code>1. I type &lt;leader&gt;
  2. Plugin pops up a sidebar with "gc - fugitive commit, gd - fugitive diff" etc
  3. I can continue typing my command
  </code></pre>