Retain SVN history with Designer
Renaming resources in Designer 5.x breaks SVN version history, as Designer deletes the old file and creates a new file with the new name in its place. Strangely enough, the new file has the same creation date as the old one (the modified date is correct, though).
The way around this is to rename/restructure your project using your SVN client, which will track version history, and then reload the project in Designer. By doing this, you will miss out on Designer’s “intelligent” refactoring features, so you need to weigh the pros and cons in each case.