title: VIM Disable insert mappings of plugins
body: <p>A plugin adds to my insert mappings a mapping for <code>&lt;leader&gt;is</code>. I have some ideas which one it can be. But it does not matter I don't want to change anything in foreign plugins. So I want to disable this mapping. I tried this:</p>
  
  <pre><code>imap &lt;leader&gt;is  &lt;nop&gt;
  </code></pre>
  
  <p>I did not help.</p>
  
  <p>What is your suggestions?</p>
  
  <p>BTW, I want to ask how disable in vimrc all insert mapping of plugins?</p>