title: Vim insert mode file path completion
body: <p>I want to change where vim looks for file completion, but only in insert mode.  For example:</p>
  
  <p>I open gvim inside of the <code>CG-Website</code> directory.</p>
  
  <p>This is my directory structure: </p>
  
  <p><img src="https://i.stack.imgur.com/8x1pH.png" alt="enter image description here"></p>
  
  <p>Then i go in to the css folder and open <code>style.css</code></p>
  
  <p><img src="https://i.stack.imgur.com/wdrpU.png" alt="enter image description here"></p>
  
  <p>using <code>:e src/static/css/style.css</code></p>
  
  <p>Now i am inside of style.css and i want to complete a file name that is down one directory.</p>
  
  <p>I want to be able to type <code>../</code> in <code>INSERT</code> mode and have all the files/folders that are inside of the static folder show up, instead of the <code>www</code> folder which is what it does right now.</p>
  
  <p>However I don't want to change the actual directory, because I still want <code>:e</code> to work normally.</p>