When you click the copy class icon in admin that leads you to class/copy/<id> view, the new class gets the same remote id as the old one.

This leads to issues when you're for instance work on a local copy of a site, and want to export your new class (a copy) to the live server that already have the class the copy class is based on. Basically you'll get a warning when you try to import it that the class already exists and options to overwrite it or create a new class based on the package (so it ends up with a different identifier++).

Steps to reproduce

1. Create a copy of a class
2. Look in the ezcontentclass table and compare the remote_id on the two classes