Since a while using the eap/preview, I cannot search for usages on method implementations and include the interface results. When looking at the configuration screen as described on the intellij docs, I can only select 'open in new tab':
This is pretty annoying, always needing to go to the interface to have all the results.
Using the preview of Intellij 15 build 143.249. I'm not sure, but a colleague of mine said this was also an issue on the latested fix version of 14?