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I had an activity diagram that I wanted to duplicate. There is no Save As or Copy/Paste option for diagrams. Unable to perform the task, would have to re-create the diagram from scratch. Clicked on Edit->Copy when the diagram was selected in the Projects View. Then clicked Edit->Paste. I would expect it to create a copy of the diagram with a name like "Copy of <original diagram name>", but nothing happens. No action.
Also please look at issue 83789: http://www.netbeans.org/issues/show_bug.cgi?id=83789 Copying diagram items by hand and pasting them into a new diagram does not work either. So basically there is no working option to duplicate/save as/copy a diagram in any way it seems
see issue 79771
issue is verified in all-nbms-hydra-070323_3 Main feature works well. related issues are filed separately.