title: What does this symbol mean in IntelliJ? (check mark between file icon and file name)
body: <p>In the project navigator in IntelliJ IDEA I have an icon similar to a check mark between the file icon and file name. I can't find any explanation in the  <a href="https://www.jetbrains.com/help/idea/2016.1/icons-reference.html?origin=old_help" rel="noreferrer">Icon Reference</a>.</p>
  
  <p>Does anybody know what it means?</p>
  
  <p><a href="https://i.stack.imgur.com/eSZfQ.png" rel="noreferrer"><img src="https://i.stack.imgur.com/eSZfQ.png" alt="IntelliJ IDEA check mark between file icon and file name in Project Navigator"></a></p>