title: One of My .H Files Suddenly Causes Problems
body: <p>One of my .h files looks funny all of a sudden (the one colored in red in the screenshot):</p>
  
  <p><img src="https://i.stack.imgur.com/J1jDk.png" alt="enter image description here"></p>
  
  <p>I tried to delete the file and re-enter it; it works while the project remains open, but once I close the project and re-open it it becomes 'weird' again.</p>
  
  <p>Anyone has any idea what may cause this and how to solve it?</p>