title: Why does git keep deleting my folder?
body: <p>I have a folder in my repository called 'activity'. It keeps getting strangely deleted from the repository, and isn't seen as an untracked file.</p>
  
  <p>In github, it is rendered as a folder with a green arrow, and the text '→ f32111b' next to it. This has happened several times now, and only with this one folder. </p>
  
  <p>I've already checked .gitignore. Is there another reason why a folder called 'activity' would be trouble in git? </p>