Q: With IntelliJ, how do you know what are the files you have on your disk, but that are not checked in your Subversion repository?
A: Simple, go the menu Windows, Tool Windows, Changes. In the Changes window, make sure you are looking at the Local tab. There you will have the list of the files you have on disk, but that are not checked in. You can see this as a flat list, or organized by directory, as shown in this screenshot.