Use a project hosted by a filesystem/local Git repository. Make changes to any file in the project. Switch to the "Source Control" Navigator, and the "Changes" sub-navigator within that. Select "Uncommitted Changes", or any file below that. Verify that your changes appear in the source change browser/editor on the right. Click the "Stage All" button. Absolutely nothing happens, 90% of the time. Go back to the Changes navigator, right-click on an item there and select the "Stage Changes in..." popup menu item. It works, every time. I haven't found any pattern to the 10% of the time the "Stage All" button actually works, wrt what changes are selected in the navigator, whether I've already typed a commit message, etc.. I happen to be using Xcode 16.0 on two Macs: a Mac Studio running MacOS 14.6.1, and a 2019 MacBook Pro running MacOS 14.7.1. Both exhibit the same symptoms.

I've got a very simple command-line Swift project that contains a couple of OpenGL shader source files. They need to be accessed at run-time in order to be compiled and linked. For initial debugging, I hard-coded the absolute path to their location in the Xcode project directory, but I switch back and forth between two machines (MacBook Pro and Mac Studio) for which the project paths are different, so this doesn't work well. To solve this, I thought I could get Xcode to copy the shader sources over with the executable file at build time. I'm aware that technically, command-line apps have no resource bundle, but the "Build Phases" -> "Copy Files" section of the project configuration isn't disabled for my project, so I assumed that it could handle this. I added the two shader source files to the set of files to copy, via the "+" button, and set the Destination to "Products Directory". I left the "Subpath" field blank. AFAICT, nothing happens: the "Products/Debug" sub-directory of "~/Library/Developer/Xcode/DerivedData/..." has the executable, but neither of the shader sources. In fact, they don't appear anywhere inside ~/Library/Developer/Xcode. Okay, perhaps I need to uncheck "Copy only when installing" in the project config? Sadly, as soon as I click to uncheck it, Xcode crashes, even if that's the very first thing I do immediately after Xcode restarts. FWIW, I'm running Xcode 16.2 on a late 2019 MacBook Pro running Sonoma 14.6.1, but I'm pretty sure I've experienced the problem on my 2024 Mac Studio as well.