[Eap-features] Highlighting unused variables

[Bryan Young]

I really like how idea highlights unused private variables.  I do have one suggestion though.  Idea currently highlights any parameters that are not used in a method.  It seems that if the method is inherited, I may not have any reason to use it.  I'm simply conforming to the interface.  Idea still flags those.  It highlights the unused parameter as if I have any control over it. I would think it would be a simple change to fix this behavior.