I just verified that this bug was introduced in version 7 as it does not happen in 6.3.
I could not scroll my schema.rb. I was getting the "Double quoted string with no interpolation warning" whenever I moused over the scroll bar (I don't know if it's possible to even have schema.rb with single quouted strings, but then again I don't really care). This prevented me from being able to scroll using the scroll bar. I had to turn off that warning in order to resolve the situation.
Although off topic, I cannot resist pointing out that the warning itself is invalid. It is also incorrect where it implies that the style guide considers this a violation of style (essentially it says it is optional as long as you're consistent). You should remove this warning or at least have it off by default.