Please describe the problem:
Nautilus allows the user to copy a folder into itself, this can have some consequences but it is more of an issue that could only happen by an user accident.


Steps to reproduce:
1. Go to your home folder.
2. Create an empty test folder
3. Right click and copy this test folder
4. Enter the folder
5. Try paste.



Actual results:
Nautilus will now create a lot of nested "test" folders until it hits the file length limit.

If you want to try, do it on a folder that got content, if you don't cancel the process this will create a lot of files.





Expected results:
GNU's cp command seems to take this into consideration:

vx@ubuntuvx:~$ cp -R ./test ./test/omg
cp: cannot copy a directory, `./test', into itself, `./test/omg'




Does this happen every time?
Yes.

Other information: