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After you create or open a file, after you change any of the code you should be given a "Save As" option under the File Menu, so you can save it under a different name. This is not an option, so the only way to use one file to create another one is to make a copy and then open the copy. This is not intuitive in comparison to other products.
Reassigned to editor.
This should IMO not be handled in the editor module itself. Reassigning to openide/editor for evaluation.
*** This issue has been marked as a duplicate of 20147 ***