I'm not sure if the link will work.
I found that I can create folders on the same level with the same name within my project.
I tested within event sheets, and within layouts.
dropbox.com/sh/2ecdu49yb76yfyd/Rn_JRlBBZX
This is actually by design. Do you think it should be prevented? I didn't think it mattered, since folders are purely for organisation - the only things which need unique names are the layouts or event sheets themselves.
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Interesting. I don't mind either way, it's just not intuitive because operating systems don't allow it.
Closing as won't fix. I guess the behavior might be useful to some people, and we might break existing projects already using same names for folders if we change it.