What if you want to rename a file that’s used in multiple Xcode projects? Well, previously I’d rename the file in one project, then open each project in series and correct broken references. But I discovered today that this is unnecessary. If you open all of your projects first, Xcode will fix the references across all of your open projects as you rename files in any of the projects.
For all I know, this has always been a feature of Xcode. But I’ve never noticed it before. So for this stunning display of common sense: Well done, Apple!