title: Add to svn:ignore greyed out in subclipse
body: <p>I have some files which I can't add to svn:ignore using subclipse and I don't know why.</p>
  
  <p><img src="https://i.stack.imgur.com/3Ms9E.png" alt="enter image description here"></p>
  
  <p>The usual reasons for not being able to add files to svn:ignore seem to be that the file is already in the repository or that the folder the file is in hasn't been created yet. Neither of these seem to apply here so I don't know what the cause is.</p>