PathListDialog modifies all dir separators to '/'

The environment comes with the new PathListDialog.
Problem: When it opens, it converts all dir delimiters to native ones, and when closing it converts all to '/'.

Before:

PathListDialog:

After:

As a user I don't want either of these conversions.

• Why not convert all to '\': Because in some cases I am defining environment variables that are consumed bu UNIX-like tools which expect '/'. Or sometimes I am working on a remote Linux environment.
• Why not convert all to '/': Because in most cases, I want to have Paths in environments on Windows have the '\' separator since many tools out there require that.
• Bonus: Because the in-place editor and the batch editor of the EnvironmentWidget also do not meddle with my data.