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I started with a project that really encompassed two integrated applications. I created a new project, and I tried to add a source folder that was in the original project, which is when I discovered the somewhat annoying fact that a source folder can only be owned by one project. That's an annoyance for my particular situation, but that's another issue. So, I then went to the other project and removed the source folder in question from the project. I then tried to create the second project again, and when I tried to add the source folder again, it STILL said that the original project still owns that source folder. I haven't tried to exit NB and restart yet.
You may need to exit & restart.
I verified that when I exit NB and restart, I can then add the source folder in question to the second project.
most probably a duplicate of #51810. The fact that one source root is bound to one project is inherent to the design, 51810 shall allow better behaviour in these cases though. *** This issue has been marked as a duplicate of 51810 ***