title: What does the small preceding red minus icon mean in my Visual Studio Solution Explorer?
body: <p>Recently a preceding small red icon started to appear before some of my VS 2015 Solution Explorer. I definitely remember it was not there some days before. </p>
  
  <p>I think it has something to do with git source control what I am using (not sure), but can not figure what is it.</p>
  
  <p><strong>* edit *</strong> </p>
  
  <p>Added more diagnostics:</p>
  
  <ul>
  <li>The files can be opened by double click</li>
  <li>The tracking does not work for these files (I mean not activated in Solution Explorer when switching to the editor tab for that file)</li>
  <li>Editing and saving does not help</li>
  <li>Close/Reopen VS does not help</li>
  <li>Refresh does not help</li>
  </ul>
  
  <p><strong>* end edit *</strong></p>
  
  <p><a href="https://i.stack.imgur.com/ehVA5.jpg" rel="noreferrer"><img src="https://i.stack.imgur.com/ehVA5.jpg" alt="enter image description here"></a></p>