Edit Domain: unhelpful error message

[ajdapretnar]

What's wrong?

When editing column names in Edit Domain and having 100+ variables, I accidentally used the same name for two variable. Problem is, I have no idea which (because there are a 100 of them). Edit Domain says: "A variable name is duplicated."

Would be helpful is it said "Variable is duplicated" or something, so that one knows how to fix the issue.
Alternatively it could output the data, but rename the bad variables as usual in Orange (and issue a warning).

How can we reproduce the problem?

Just give two variables the same name in Edit Domain.

What's your environment?

• Operating system:
• Orange version:
• How you installed Orange:

[janezd]

Fixed via #5732.