Recently I copied a layout XML from one project to another. In the project it was copied into, it was named 'Layout 2' instead of its former name, but it was definitely there as an exact duplicate.
However I have tried this again with other layouts and nothing appears at all. I tried many different things, but it always ended up with nothing or a crash.
So does anyone have any idea why this is? I don't know how it could be so simple (copy and paste) in one instance, but impossible in others.