Save and Save As doesn't enforce unique name within user's account

[PropGit]

For discussion...

Save and Save As don't enforce a unique name within a user's account.

Saving As with the same name is not helpful as it leads to confusion about which project is which. It's okay for a project to be the same name as another but each owned by different people, but within an account, we should require that they be different project names.

Save can be used to store a project with the same name as a completely different project within a user's account by happenstance - viewing another user's project that just happens to be named equivalent to one of yours, then clicking Save. If we enforce unique project names within an account, this behavior of Save needs to be extended to do the same.

Should we let same-named projects existing within a user's account?