I find that I regularly have files which are marked as "changed" in the Changes tool, but which on a compare show as having no differences. I suspect this is because I opened the file, changed something, then undid the change; maybe just the timestamp is being compared. Although it causes no harm, when I'm working on a set of changes, these "false positives" throw me off, since I think that a file has been modified when it hasn't. I have to periodically sweep through and rollback the unchanged files. This is a minor issue but happens to me several times a week and is tiresome. One way to reproduce this: open a file, type a space, save, then undo. It should appear in the changes window. When I have a number of changes pending locally, I routinely go through them and organize them for checkin. These "false positives" take a little more time than I'd like--I have to wait for a diff, then hit F7, find no changes, close the diff dialog, then open the context menu and choose Rollback, then confirm the rollback. Enhancement: on the diff dialog, if there are no differences, highlight this in some way and offer a rollback option. Don't put up another confirmation dialog. Actually, in the diff dialog, having a greater emphasis on the number of changes in the file would help--this is one reason this problem is a hassle: the count of diffs is in fairly light text on the status bar at the bottom of the window.