title: .tfignore is not ignoring files
body: <p>I have a .tfIgnore file like below whihc is already checked-in </p>
  
  <pre><code>\xx.Phoenix.Web\bower_components
  \xx.Phoenix.Web\node_modules
  *.autogen.cs
  </code></pre>
  
  <p>I would expect that everyfile which is match with <code>.autogen.cs</code> be ignored.
  But the problem is when files are generated by t4 templates, file are shown in pending changes, see below picture, <code>xx.autogen.cs</code> is recognized as <code>add</code></p>
  
  <p><a href="https://i.stack.imgur.com/j2muP.png" rel="noreferrer"><img src="https://i.stack.imgur.com/j2muP.png" alt="enter image description here"></a></p>
  
  <p>even I tried below but still not working</p>
  
  <pre><code>Phoenix\Domain\Entities\*.autogen.cs
  </code></pre>
  
  <p>and</p>
  
  <pre><code>\Phoenix\Domain\Entities\*.autogen.cs
  </code></pre>
  
  <p>We are using Vs2013 + Tfs2017</p>