Show 'Folder already exists' in Duplication Dialog

[ghost]

Is your feature request related to a problem? Please describe.

When I duplicate a folder, I don't know if there's already a folder with the same name. If there is, pressing enter results in a message saying, Refusing to overwrite existing directory. Then, I have to repeat the same process.

Describe the solution you'd like

In the duplication dialog, it should show something like Folder already exists

[ghost]

@axelrindle You can manage error messages more efficiently.

Here's an example.

Folder name cannot be empty (Press 'Escape' to cancel)

[ghost]

You can also add File already exists to inform the user beforehand if he should proceed.